题目内容

Destruction of the environment is one of the most serious ___ we face.

A. predictions
B. challenges
C. operations
D. combinations

查看答案

搜索结果不匹配？点我反馈

更多问题

I’m busy on Monday. ___ having that game on the weekend?

A. How come
B. How often
C. How about
D. How long

Most parents have no time to ___ their children.

A. command
B. control
C. dominate
D. tutor

___, your child will leave home to lead her own life as a fully independent adult.

A. Scarcely
B. Occasionally
C. Seldomly
D. Eventually

Dogs hear far better than human beings do. They are able to hear high ___ that humans cannot hear.

A. variations
B. channels
C. frequencies
D. repetitions