Unit 7 DCABA BACDA AC
新概念英语第4册课后习题:
Multiple choice questions 多项选择题
Choose the correct answers to the following questions.
Comprehension 理解
1 What happens if you shout on a mountainside?
a.You will be able to measure distance.
b.Nothing.
c.It will take a long time for an echo to come back.
d.You will hear an echo.
2 You can measure the depth of the sea by ____.
a.shouting so you get back an echo
b.tapping on the hull of a ship
c.working out how long it takes to get an e ...


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