Unit 4. Buying fruit
单词：an apple,apples/a banana,bananas/a mango,mangoes/an orange,
oranges/a peach,peaches/a pineapple,pineapples/a watermelon,
watermelons/a pear,pears/a grape,grapes/
句型：
1.----What are these/those? ----They’re …
2.----Can I help you?/What would you like? ----I’d like some…,please.
----These or those? ----The red ones,please.
----How many kilos?---…kilos,please.----Here you are….yuan,please.
语音：/ /thin think thank three thirteen thirty mouth
/ /there these those this that they with than
