单选题

单选题 What is the lecture mainly about?

【正确答案】 D

【答案解析】[听力原文]

Narrator
Listen to part of a lecture in a geology class.

Professor
So, continuing our discussion of desert lakes, now I want to focus on what is known as the Empty Quarter.

单选题 What is the professor"s opinion about the conclusions of the recent study of the limestone formations in the Empty Quarter?

【正确答案】 D

【答案解析】

单选题 According to the professor, what feature of the sand dunes made the formation of the lakes possible?

【正确答案】 B

【答案解析】

多选题 How is it possible to determine in which rainy period a lake was formed? Choose 2 answers .

【正确答案】 A、D

【答案解析】

单选题 What does the professor imply about the lack of water buffalo and hippopotamus fossils in the more recent lakes?

A、 The level of water in the lakes was not sufficient for these animals.
B、 The bottoms of the lakes were too sandy for these animals to stand in.
C、 The location of the lakes made them too difficult for these animals to reach.
D、 The vegetation near the lakes did not attract these animals.

【正确答案】 A

【答案解析】

单选题 What possible explanation does the professor give for the apparent absence offish in the most ancient lakes?

【正确答案】 C

【答案解析】