2021-2022学年外研版(2019)必修一:Unit2
Exploring
English
Using
language
学习目标:学习构词法
了解简单句五种基本的句子结构并能准确判断;
通过(翻译)练习熟练运用简单句的五种基本句子结构。
重点难点:
重点
了解简单句五种基本的句子结构;
通过(翻译)练习熟练运用简单句的五种基本句子结构。
2.
难点
(1)
在学习中培养自己的思维品质(观察、比较、概括归纳);
(2)
翻译练习及图片文字化。
英
语
构
词
法
正确运用构词法知识是学习词汇的重要途径,同时也是扩大词汇量的一个重要方法。英语构词法主要分为派生法、合成法、转化法等。牢固掌握并熟练运用构词法知识,不仅有助于提高考生辨识生词的能力,还能运用到高考完形填空、语法填空和短文改错三大题型与词性转换相关的考查当中。而且高考阅读理解中的猜测词义题有时也会考查并运用到此语法知识。
一、转化法
不改变词形,把一个词由一种词性转化为另一种词性的构词法叫作转化法。
动词→名词
look→have
a
look看一眼
survey→make
a
survey调查
名词→动词
book
n.→v.预订 name
n.→v.命名
形容词→动词
slow
adj.→v.减慢
free
adj.→v.释放
warm
adj.→v.使变暖;加热
correct
adj.→v.改正
形容词?副词
hard
adj.?adv.努力地
deep
adj.?adv.深深地
[注意]
hardly意为“几乎不”;high,
deep,
wide作副词时指的是具体意义上的“高”“深”“广阔地”,而表示抽象意义时则分别用highly,
deeply和widely。
二、派生法
在词根之前或之后加上某个词缀生成一个新词的构词法,即派生法。加在词根之前的词缀叫作前缀,加在词根之后的为后缀。
1.形容词变名词的常见后缀
后缀
例词
?age
short→shortage
不足;短缺
?cy
efficient→efficiency效率;功效
fluent→fluency流利;流畅
accurate→accuracy准确性
private→privacy隐私;私密
?dom
free→freedom自由;自主
wise→wisdom明智;智慧
?ence
different→difference差异
silent→silence沉默
?ness
weak→weakness虚弱;弱点
kind→kindness仁慈;好意
careless→carelessness粗心大意
dark→darkness黑暗
?th
strong→strength力气;强项
warm→warmth温暖;热情
true→truth
真实
wide→width宽度
?y
?ty
?ity
difficult→difficulty困难
cruel→cruelty残酷;残暴
safe→safety安全
disable→disability无能;残疾
responsible→responsibility责任
2.形容词变副词的常见后缀
规则
例词
一般情况加?ly
slow→slowly缓慢地
以“辅音字母+y”结尾,将y改为i然后加?ly
happy→happily高兴地
steady→steadily稳定地
busy→busily繁忙地
以?le结尾,去掉e加?y
simple→simply简单地
gentle→gently温柔地
terrible→terribly可怕地
possible→possibly可能地
以?ic结尾,加?ally
economic→economically经济地
scientific→scientifically科学地
常考容易拼错的副词
rudely;truly;politely;widely;nicely;closely;fortunately;surprisingly;increasingly;
hurriedly;healthily
3.动词变名词的常见后缀
后缀
例词
?al
approve→approval赞成;批准
survive→survival
幸存
?ance
appear→appearance出现;外貌
guide→guidance指引;指导
?ence
prefer→preference偏爱
refer→reference参考;查阅
?ion
attract→attraction吸引
evaluate→evaluation评估
?ation
explain→explanation解释
starve→starvation挨饿
?(s)sion
decide→decision决定
admit→admission接纳;准许入学
?ing
hear→hearing听力;听觉
begin→beginning开始
?ment
argue→argument辩论;论据
treat→treatment对待;治疗
?ure
fail→failure失败
press→pressure压力
?ture
mix→mixture混合;混合物
depart→departure离开;出发
?y
recover→recovery恢复;痊愈
discover→discovery发现
其他
grow→growth成长;发展
choose→choice选择
vary→variety多样化;种类
tend→tendency趋向;趋势
4.动词、名词变形容词的常见后缀
后缀
例词
?able
accept→acceptable可接受的
suit→suitable合适的
?al
music→musical音乐的
origin→original最初的
?ful
doubt→doubtful怀疑的
care→careful
细心的
?(e)d
worry→worried担心的
bore→bored厌倦的
?ing
surprise→surprising令人惊讶的
bore→boring令人厌烦的
?ible
access→accessible容易达到的
terror→terrible可怕的
?ive
act→active积极的;活跃的
instruct→instructive有教育意义的
?ous
continue→continuous不断的;持续的
anxiety→anxious忧虑的
?some
tire→tiresome令人厌倦的
trouble→troublesome麻烦的
?y
taste→tasty美味的;可口的
wealth→wealthy富裕的;丰富的
?ern
east→eastern东方的
west→western西方的
?ish
child→childish孩子气的
self→selfish自私的
?ic
economy→economic经济的
history→historic历史上著名的
?ary
imagine→imaginary想象的
5.表示“人”的常见后缀
在某些形容词、名词或动词后面加后缀变成具有某种职业或动作的人。常见的表示“人”的后缀有:
后缀
例词
?er
teach→teacher教师
village→villager村民
?ar
lie→liar说谎者
beg→beggar乞讨者;乞丐
?ee
employ→employee雇员
train→trainee受训者;学员
?or
invent→inventor发明者
educate→educator教育工作者
?ess
act→actress女演员
host→hostess女主人
?ese
China→Chinese中国人
Japan→Japanese日本人
?an
America→American美国人
Australia→Australian澳大利亚人
?ian
music→musician音乐家
history→historian历史学家
?ist
novel→novelist小说家
tour→tourist游客
?ant
serve→servant仆人
participate→participant参加者
6.表示否定或相反意义的词缀
词缀
例词
前缀
dis?
agree→disagree不同意
appear→disappear消失
il?
legal→illegal不合法的
logical→illogical
不合逻辑的
im?
patient→impatient不耐烦的
moral→immoral
不道德的
in?
formal→informal非正式的
direct→indirect
间接引起的
ir?
regular→irregular不规则的
responsible→irresponsible不负责任的
mis?
lead→mislead误导
understand→misunderstand误解
un?
usual→unusual不寻常的
willing→unwilling
不愿意的
后缀
?less
hope→hopeless绝望的
care→careless粗心的
end→endless没完没了的
use→useless无用的
7.变为动词的词缀
词缀
例词
前缀
en?
courage→encourage鼓励
danger→endanger危及
后缀
?en
broad→broaden使变宽
ripe→ripen使成熟
?ify
class→classify把……分类
simple→simplify简化
?ize
apology→apologize道歉
emphasis→emphasize强调
三、合成法
把两个或两个以上的单词合成一个新词的构词法叫作合成法。通过合成法构成的单词称作合成词,包括合成名词、合成形容词、合成动词、合成副词等。
1.合成名词
构成
例词
名词+名词
newspaper报纸 babysitter保姆
形容词+名词
greenhouse温室 highway高速公路
动词+副词
get?together联欢会 breakthrough突破
副词+动词
outbreak爆发
downfall垮台
其他构成
well?being健康 grown?up成年人
go?between媒人
bride?to?be准新娘
son?in?law女婿
by?product副产品
2.合成形容词
构成
例词
形容词/数词+名词+?ed
absent?minded心不在焉的
one?sided片面的
名词/副词+分词
peace?loving热爱和平的
well?dressed穿着体面的
名词+形容词
snow?white雪白的
tax?free免税的
形容词/数词+名词
second?hand二手的
large?scale大规模的
形容词+分词
good?looking好看的
easy?going随和的
数词+名词+形容词
18?year?old
18岁大的
20?meter?wide
20米宽的
3.其他合成词
构成
例词
合成动词
upset overcome undergo overcharge
合成副词
afterwards upstairs anywhere forever
合成介词
outside within into
构词法练习
单句语法填空
1.My
English
improved
a
lot;
more
importantly,
I
gained
much
________
(confident).
2.Smoking
during
pregnancy
________
(danger)
your
baby's
life.
3.It
was
a
________
(fog)
cold
morning
when
he
set
off
for
the
remote
village.
4.People
certainly
have
a
variety
of
reasons
for
going
back
to
school
but
one
important
thing
to
know
is,
no
knowledge
is
________
(use).
5.The
________
(protect)
and
improvement
of
the
human
environment
is
a
major
issue
which
affects
all
the
people
and
economic
development
throughout
the
world.
6.The
meeting
supposed
to
be
________
(success)
turned
out
to
be
a
failure
in
the
end.
7.Customs
officials
________
(cover)
a
plot
to
smuggle
weapons
into
the
country.
8.Ann
will
be
remembered
for
her
ability
and
her
________
(warm).
9.The
cooling
wind
swept
through
our
bedroom
windows,
making
air
conditioning
________
(necessary).
10.It
has
a
highly
________
(regular)
shape,
covered
with
bumps
and
indentations.
11.It
is
________
(legal)
to
sell
tobacco
to
someone
under
16.
12.Extracurricular
activities
________
(able)
the
students
to
know
how
to
apply
the
knowledge
learned
in
the
textbooks.
13.You
can
rely
on
him
because
he
is
quite
________
(rely).
14.People
on
welfare
are
wrongly
seen
as
lazy
or
________
(honest).
15.You
may
find
to
your
________
(amaze)
that
there
is
more
kindness
in
your
community
than
you
ever
believe
possible.
16.I
cannot
control
my
body
well.
My
legs
become
________
(pain).
17.Late
last
year
the
Thompsons
took
part
in
a
television
documentary
(纪录片)
to
prove
that
not
all
gifted
children
are
the
result
of
extremely
________
(ambition)
parents.
18.Under
her
________
(encourage),
I
would
spend
hours
burying
myself
in
novels,
even
if
my
friends
just
laughed
at
me.
19.The
________
(grow)
number
of
Chinese
tourists
traveling
to
Spain
has
in
recent
years
offered
opportunities
for
local
companies.
20.China
has
once
again
showed
its
ability
to
change
the
world
with
its
“new
four
great
________
(invent)”.
21.I
________
(firm)
believed
I
could
learn
lots
of
words,
phrases,
translation
skills,
news
stories
and
even
amazing
knowledge
by
reading
it.
22.In
most
________
(develop)
countries,
like
America
and
the
Great
Britain,
teaching
is
a
profession.
23.________
(luck),
native
English
speakers
can
understand
each
other
even
if
they
don't
speak
the
same
kind
of
English.
24.Being
________
(happy)
is
like
an
infectious
disease.
It
causes
people
to
stay
away
from
the
sufferer.
25.She
carried
her
left
arm
at
an
awkward
angle,
as
if
it
were
causing
her
________
(comfort).
26.It
was
________
(extreme)
difficult
to
build
such
a
wall
in
the
ancient
days
without
any
modern
machines.
27.Your
ideas
are
very
interesting,
but
we
need
________
(practice)
suggestions
to
get
us
out
of
trouble.
28.Try
to
understand
what's
actually
happening
instead
of
acting
on
the________
(assume)
you've
made.
29.Alice,
the
sales
manager
of
the
company,
is
doing
a
course
to
________
(sharp)
her
business
skills.
30.A
television
series
is
fast
gaining
its
word?of?mouth
________
(popular)
among
not
only
Chinese
households
but
also
some
foreigners.
题组二
能力提升
单句语法填空
1.(2020·安徽省黄山市屯溪第一中学高三月考)Those
who
ate
seven
ounces
or
more
of
red
or
processed
meat
daily—or
got
the
________
(major)
of
their
protein
from
meat—had
a
23
percent
higher
risk
of
premature
death,
according
to
Science
Daily.
2.(2020·安徽省六校教育研究会高三第一次素质测试)Check
out
course
and
program
________
(describe),
reviews
of
professors,
and
sit
in
on
some
classes
if
you're
able
to
visit
campus.
3.(2020·湖北省孝感市第一中学高三年级月考)They
________
(accident)
found
out
that
soil
does
not
only
attract
fat,
it
could
also
stop
fat
from
being
absorbed
into
the
body
and
round
the
digestive
system.
4.(2020·湖南师范大学附属中学高三摸底考试)So
music
wasn't
really
________
(entertain),
but
a
means
for
musicians
to
accomplish
political
and
social
goals.
5.(2020·天一大联考皖豫联盟体高三上学期第一次考试)The
evolution
is
what
has
led
to
the
present
________
(appear)
of
the
kiwi
bird.
6.(2020·广西柳州市高三上学期摸底考试)People
who
have
breakfast
are
more
likely
to
lose
________
(weigh)
than
those
who
don't
eat
a
morning
meal.
7.(2019·深圳耀华实验学校月考)Life
is
just
a
blank
cloth—you
can
paint
a
beautiful
scene,
or
you
can
paint
black
ghosts
(鬼)
and
________
(danger)
people.
8.(2019·山西大学附中高三模块诊断)How
would
you
feel
if
you
woke
up
and
found
your
entire
computer's
contents—including
your
photos,
your
recent
documents—no
longer
________
(access)?
9.
The
college
years
are
supposed
to
be
a
time
for
important
________
(grow)
in
autonomy
(自主性)
and
the
development
of
adult
identity.
10.As
a
volunteer
of
environmental
protection,
I
am
writing
to
raise
your
________
(aware)
of
protecting
the
environment.
题组三
体验真题
1.
(2020年新课标卷II·语法填空)
Chinese
New
Year
is
a
61
(celebrate)
marking
the
end
of
the
winter
season
and
the
beginning
of
spring.
2.
(2020年新课标卷III·语法填空)Filled
with
64
(curious),
the
artist
packed
his
bags
and
left.
3.
(2020年山东新高考·语法填空)In
the
18th
and
19th
centuries,
36
(wealth)
people
travelled
and
collected
plants,
historical
objects
and
works
of
art.
4.
(2020年山东新高考·语法填空)
Historical
44
(accurate)
is
important
but
so
is
entertainment.
5.(2019年新课标卷II·语法填空)But
then
we
got
an
official
letter
and
we
were
blown
away.
We
are
so
proud
of
her.
It's
___70___
(wonder).
6.(2019年新课标卷III·语法填空)When
they
were
free
from
work,they
invited
us
to
local
events
and
let
us
know
of
an
interesting
___66___(compete)to
watch,together
with
the
story
behind
it.
7.
(2019年新课标卷I·语法填空)
It
is
difficult
to
figure
out
a
global
population
of
polar
bears
as
much
of
the
range
has
been
___62___
(poor)
studied;
however,
biologists
calculate
that
there
are
about
20,000-25,000
polar
bears
worldwide.
8.(2018年新课标卷II·语法填空)This
switch
has
decreased
___66___
(pollute)
in
the
country's
major
lakes
and
reservoirs
and
made
drinking
water
safer
for
people.
9.(2018年新课标卷II·语法填空)According
to
the
World
Bank,
China
accounts
for
about
30
percent
of
total
___67___
(globe)fertilizer
consumption.
10.
(2018年浙江卷·语法填空)The
obvious
one
is
money;
eating
out
once
or
twice
a
week
may
be
___62___(afford)
but
doing
this
most
days
adds
up.
There
could
be
an
even
__
higher___
(high)
cost
on
your
health.
Researchers
have
found
that
there
is
a
direct
link
between
the
increase
in
food
eaten
outside
the
home
and
the
rise
in
___64___(weigh)
problems.
答案
题组一
基础过关
www.
一、单句语法填空
1.
【答案】confidence
【解析】句意:我的英语提高了许多;更重要的是,我的自信心增强了不少。句中的much为限定词,后应接名词,作宾语。根据派生法规则,confident的名词形式为confidence。
2.【答案】will
endanger
【解析】句意:孕期抽烟会危及胎儿生命。句中所填词应为谓语动词,意为“危及”;根据派生词构词法规则,可在名词前加前缀en?,转化为相应意义的动词,即endanger;另外,本句表示叙述在某种情况下有可能发生的事,应用情态动词will,故填will
endanger。
3.【答案】foggy
【解析】句意:在一个寒冷的起雾的上午,他向那个遥远的村庄进发了。句中所填词修饰morning,作定语。根据派生法规则,fog的形容词形式为foggy。
4.
【答案】useless
【解析】句意:对于重返学校,人们当然有各种理由,但是有一点需要知道的重要的事是,知识是有用的。所填词涉及否定意义的后缀:名词+?less构成形容词。所填词作系动词is的表语,且根据语境,此处应填表示否定意义的形容词,构成双重否定。useless
“无用的”。
5.【答案】protection
【解析】句意:人类环境的保护和改善是一个影响全世界人民和经济发展的大问题。根据“and
improvement”可知,所填词为protect的名词形式。根据派生法规则,在protect后加后缀?ion变为名词。
6.
【答案】successful
【解析】句意:那场本应该成功的会议最终被证明是失败的。所填词作be的表语,应填形容词。根据派生法规则,在success后加后缀?ful,构成形容词。
7.【答案】uncovered
【解析】句意:海关官员发现了一个走私武器入境的阴谋。句中所填词应为谓语动词,根据后面的宾语a
plot可知,此处应表示“发现,揭露”;根据派生词构词法规则,在动词前加前缀un?,转化为相反意义的动词,故填uncovered。
8.
【答案】warmth
【解析】句意:安因为她的能力和热情友好,将被铭记。所填词位于形容词性物主代词her之后,应填名词。根据派生法规则可知warm的名词形式,即在词尾加后缀?th。
9.
【答案】unnecessary
【解析】句意:凉爽的风吹过卧室的窗户,使得空调都没有必要了。所填词在句中作宾语补足语,应填形容词,根据语境可知,此处表示“没有必要的”;根据派生词构词法的规则,可在形容词前加表示“没有,不”的前缀un?,故填unnecessary,意为“没有必要的”。
10.【答案】irregular
【解析】句意:它的外形极不规则,满是凸块和凹陷。句中为形容词作定语,修饰名词shape,根据后面的过去分词短语可知,所填词表示“不规则的”;根据派生词构词法规则,在形容词前加前缀ir?,转化为相反意义的形容词,故填irregular。
11.【答案】illegal
【解析】句意:出售烟草给16岁以下者是非法的。所填词在句中作表语,且根据“to
someone
under
16”可知,此处表示“非法的”。根据派生法规则,应加前缀il?。
12.【答案】enable
【解析】句意:课外活动可以使学生们知道怎样运用在课本上学到的知识。所填词在句中作谓语动词,根据派生法规则,able的动词形式需要在词首加前缀en?即可,enable
意为“使……能够”。
13.
【答案】reliable
【解析】所填词用在系动词is后,作表语,根据句中的“rely
on
him”可知,所填词表示“值得信赖的”,根据派生法规则,rely的形容词形式需要将字母y改为i,再加后缀?able。
14.
【答案】dishonest
【解析】句意:靠福利救济的人被误认为懒惰或不诚实。根据语境可知,应填形容词,并表示否定意义,即
“不诚实的”;根据派生法规则,只需在词首加前缀dis?。
15.【答案】amazement
【解析】句意:你可能会惊奇地发现,在你的社区,洋溢着难以置信的友爱。所填词位于your之后,应用名词形式;根据派生法规则,只需在词尾加后缀?ment即可变为名词。
16.
【答案】painful
【解析】句意:我无法很好地掌控我的身体。我的双腿变得疼痛。所填词位于连系动词之后,应用形容词作表语;根据派生法规则,只需在词尾加后缀?ful即可构成painful
“疼痛的”。
17.【答案】ambitious
【解析】根据空格位置,后面是名词parents,应该使用形容词作定语,故填ambitious。
18.【答案】encouragement
【解析】句意:在她的鼓励下我总会花几个小时埋头看小说,即使朋友们嘲笑我。这里需用名词,指的是“在她的鼓励下”。
19.【答案】growing
【解析】该空格处后面的词“number”是名词,名词受形容词修饰限制,grow为动词,动词转化为形容词时,常用v.?ing表示主动进行,v.?ed表示被动完成。此处表示大量中国游客去西班牙旅行,这个数量一直在增长中,表示进行,故答案为growing。
20.
【答案】inventions
【解析】句意:中国用“新四大发明”再次展示了改变世界的能力。前面有形容词性物主代词修饰,且作介词的宾语,故这里用名词形式invention,且为可数名词,故用复数形式。
21.【答案】firmly
【解析】空格后的believed为动词,动词受副词修饰,故答案为firmly。
22.【答案】developed
【解析】句意:在美国和英国等发达国家中,教书是一种专业。develop的形容词变体有developing
“发展中的”和developed
“发达的”两种形式,句中修饰美国和英国,故答案应为developed。
23.【答案】Luckily
【解析】句意:庆幸的是,英语为母语者能够彼此理解,即使他们不讲同一种类的英语。所填词修饰整个句子,因此使用副词,故答案为Luckily。
24.【答案】unhappy
【解析】句意:不快乐就像传染病一样,会使得人们对于不快乐的人退避三舍。根据此空后面的“like
an
infectious
disease
(像一个传染病一样)”可知,此处应该使用happy的反义词,故填unhappy。
25.
【答案】:discomfort
【解析】句意:她的左胳膊很不自然地抬着,好像它让她不舒服似的。设空处前有形容词性物主代词修饰,所以用名词。由句意可知用discomfort“不舒服”。
26.【答案】extremely
【解析】此空并不是系动词was后的表语,作表语的是difficult,空格处所填词修饰difficult,故填副词。
27.【答案】practical
【解析】此处表示“可是我们需要切实可行的建议帮我们脱离困境”,故用practice的形容词形式practical。
28.【答案】assumption
【解析】句意:试着去理解实际发生的事情,而不是按照你所做的假设行事。前面是定冠词the,后面跟名词形式,故填assumption。
29.【答案】sharpen
【解析】句意:这家公司的销售经理Alice正在学习一门课程来提高她的业务技能。sharpen
“加强,提高”,不定式在此作目的状语。
30.
【答案】popularity
【解析】根据空格位置,前面有形容词性物主代词its和word?of?mouth,后面应该为名词。popular为形容词,它的名词变化为后面加?ity,故填popularity。
题组二
能力提升
单句语法填空
1.【答案】majority
【解析】该空格前有the,后有介词of,因此需用名词形式majority。
2.【答案】descriptions
【解析】句意:查看课程和项目描述,教授的评论,如果你能参观校园,可以旁听一些课程。结合句意可知此处应用名词,description可作可数名词,前面没有限定词,故用复数形式。故答案为descriptions。
3.【答案】accidentally
【解析】分析句子可知,修饰动词“found
out”应用副词,故填accidentally。
4.【答案】entertainment
【解析】空格处对应后面的“a
means”,应填名词形式,故填entertainment。
5.【答案】appearance
【解析】此处表示“外观”,present在句中为形容词,因此空格处应填名词形式。
6.【答案】weight
【解析】lose
weight固定短语,“减肥”,故填weight。
7.【答案】dangerous
【解析】修饰后面的名词people,使用形容词作定语,指危险的人们。
8.答案:accessible
【解析】此处是“find+sb./sth.+adj.”结构,意为“发现某人(物)……”。形容词作宾语补足语,所以填accessible。
9.【答案】growth
【解析】前面有形容词important修饰,此处应填名词growth和后面的development构成并列关系。
10.【答案】awareness
【解析】在形容词性物主代词your后面,用名词形式。句意:作为环保志愿者,我书面倡议大家提高环保意识。
题组三
体验真题
1.
61.
【答案】celebration
【解析】考查名词。根据空白处之前的
a
和后面的非谓语动词
marking,可知此
处应填名词
celebration。
2.64.
【答案】
curiosity
【解析】此考查名词。
【解析】此处介词
with
的宾语应该由名词充当,故用名词形式curiosity。
3.
36.
【答案】wealthy
【解析】此处应用形容词
wealthy(富有的)作定语修饰名词
people。
4.44.
【答案】accuracy
【解析】根据空白处之前的形容词historical及后面的谓语动词is可知,此处应填名词
accuracy
作句子的主语。
5.
【答案】wonderful
【解析】考查形容词作表语。根据句子结构可知,在系动词is之后用形容词形式作表语,故填wonderful。
6.
【答案】competition
【解析】考查名词。由空格前的不定冠词an与空格后的不定式to
watch可以确定空格处应该填名词形式。故填competition。
7.
【答案】poorly
【解析】根据句意和结构分析可知,此处用副词poorly修饰谓语动词has
been
studied,意为“研究很少”。故填poorly。
8.
【答案】pollution
【解析】考查词性转换。句意:这一转变减少了中国较大的湖泊和水库的污染,使人们的饮用水更加安全。has
decreased后跟名词作宾语,故填pollution。
9【答案】.global
【解析】考查词性转换。句意:中国约占全球化肥总消费量的30%。fertilizer
consumption是名词短语,故应该用形容词修饰。故填global。
10.
62.
【答案】affordable。
【解析】此处表示一周一两次外出吃饭是负担得起的,系动词be后用形容词作表语,表示“负担得起的”故填affordable。
64.
【答案】
weight。
【解析】此处指体重问题,用名词修饰problems,故填weight。