(4)keep it up表示"不松劲"、"保持成绩"或"继续下去"，而 keep up with则表示"跟上"、"不落在……后面"：

　　You've made much progress. Keep it up!　你已取得了很大进步。继续努力!

　　If you keep it up, you'll be able to set up a new world record.　你如果保持下去/不松劲，你就能创一项新的世界纪录。

　　Although he walked as fast as he could, he still couldn't keep up with his father.　虽然他尽快走，但他仍跟不上他父亲。

　　In order to keep up with his classmates, he worked harder than ever.　为了跟上同学，他比以往任何时候都更努力。

　　(5)keep out可以表示"(使)留在外面"、"(使)不进入"：

　　He shut all the doors and windows to keep out the wind.　为了挡风，他关上了所有的门窗。

　　16,000-volt power line. Keep out!　16,000伏高压线，不可靠近!

　　(6)keep in的含义之一为"(把……)留在里面/关在屋里"、"不出外"：

　　It's very cold today. We'd better keep in.　今天很冷。我们最好别出去。

　　When the dog was kept in, it barked loudly.　那条狗被关在屋里时狂吠不止。

　　新概念英语第二册第78课课后练习答案 Key to written exercises

　　1.关键句型练习答案

　　B 1 I'm making some coffee. Do you want some/any?

　　2 Exports have increased this year.

　　3 My dog is afraid of thunder and lightning.

　　4 The boy was sent to a school for the deaf.

　　5 Tax laws help the rich.

　　6 I spent the evening listening to some music.

　　7 Crime does not pay.

　　8 Would you like an apple or an orange?

　　9 Are you an artist or a musician?

　　10 Do you take sugar in your tea?

　　2.难点练习答案

　　1 away from 2 off 3 up 4 on 5 out 6 up with 7 in

　　3.多项选择题答案

　　1a 2c 3b 4b 5c 6a

　　7c 8b 9a 10b 11c 12a

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