Unit 3
I’m twelve.
习题
一、选择题
1. -- _______________________?
-- There are sixteen.
A. How many books are there? B. What’s your number? C. What are those?
2. -- What’s eleven and seven?
-- ______________________.
A. Eleven and seven is seventeen. B. It’s eighteen. C. It is eighty
3. Ten and nine is .
A. seventeen B. nineteen
C. eighteen D. twenty
4. — are you?
—I’m fifteen.
A. What B. How C. How old D. What’s
二、将下列算式翻译成英语
例：12+5=17
Twelve and five is seventeen.
1. 13+7=20
2. 10+9=19
3. 14+2=16
4. 11+3=14
5. 12+3=15
