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问题描述：
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1.What are the boys doing?
They _______ the farmers _____ apples.
A.help;to pick B.are helping;picking C.help; pick D.are helping;pick
2.What do you think of the three lessons in this unit?
I think Lessons 3 is _____ one of all.
A.difficult B.easy C.the most difficult D.most difficult
3.I want to find another house to live in.
Why?
Because it is too noisy ________the neighborhood.
A.at B.on C.of D.in
答
D.are helping pick
C.the most difficult
D.in