选择题：The last sentence means that a knowledge of fish sounds can help man to ______.

题目内容：

The last sentence means that a knowledge of fish sounds can help man to ______.

A. avoid confusion in fishing activity

B. avoid unneeded effort in fish sound studies

C. detect enemy submarines

D. pick up new sounds

参考答案：

If there are any new words, ______ in a dictionary.

If there are any new words, ______ in a dictionary.A. look them throughB. look them upC. look them ov

分类：习题答案题型：选择题

It ______ 12 rabbits to test a sample of vaccine, now it takes only 6.A. used to takingB. used to tak

分类：习题答案题型：选择题

According to the passage, it is true that ________.in the late 19th century in the United States the

分类：习题答案题型：选择题

able better toable to betterbetter to ablebetter able to

分类：习题答案题型：选择题

The purpose of non-REM sleep is even more mysterious. The new experiments, such as those _____ for th

分类：习题答案题型：选择题