求英语人教版普通高中实验教科书必修一 Unit3 Learning about Language（20页-21页）习题答案
推荐回答（2个）
不知道为什么，我这本书的20-21页也是unite3,但是是traveling journal
给你“discovering useful worlds and expressions”第一、二大题的答案吧，我这书很老了，不知道你们题目有没有变掉，你自己对对看吧。
1.he is so stubborn that no one can (persuade) him to do anything.
2.a (determinde) person always tries to finish the job, no matte how hard it is.
3.(Once) she has made up her mind, nothing will (change).
4.is it (proper) for us to take off our hats in church?
5.he (insisted) that we find the source of the trouble as soon as possible. Everyone agreed.
6.do you remember every (detail) of the story you have just read.
7.i wanted to pay the train (fare), but y friend insisted. (Finally) I gave in.
8.She persueded all of us to (cycle) to work instad of taking the bus.
第二大题：
1.waterfall
2.rapids
3.valley
4.delta
5.glacier(不确定)
6.plain
7.canyon
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