单选题：Silk's strength comes from its weak hydrogen bonds working t

题目内容：

Silk's strength comes from its weak hydrogen bonds working together. A．Right
B．Wrong
C．Not mentioned

参考答案：

答案解析：

This species has nearly died out because its habitat is bei

This species has nearly died out because its habitat is being destroyed.A．turne

分类：理工类题型：单选题

Many walls and chimneys were damaged during this quake. （　　）A．Right B．Wrong

分类：理工类题型：单选题

听音频，回答下面10题：Directions: In this section, you will hear a passage three times.

分类：理工类题型：单选题

A)It failed because of a sudden rocket explosion.B) It has been re-scheduled fo

分类：理工类题型：单选题

A) They have been hospitalized.B) They have got skin problems.C) They were cho

分类：理工类题型：单选题