1.For three quarters of its span on Earth, life evolved almost _________ as microorganisms.

A precisely

B instantly

C initially

D exclusively

2.Whoever formulated the theory of the origin of the universe, it is just _________ and needs proving.?

A spontaneous

B hypothetical

C intuitive

D empirical

3._________ are you to leave your post.

A. In any case

B. In no case

C. Without question

D. Out of the question

4.The future of this company is _________: many of its talented employees are flowing into more profitable net-based businesses.?

A at odds

Bin trouble

C in vain

D at stake

5.The authors of the United States Constitution attempted to establish an effective national government while preserving _________ for the states and liberty for individuals.?

A autonomy

B dignity

C monopoly

D stabilit

6. Anything that is dropped from a height falls towards tile center of the earth because of the pull of _________.

A. weight

B. attraction

C. gravity

D. density

7. Applicants are _________to provide evidence that their English is good enough to study in the United States.

A. demanded

B. obliged

C. due

D. necessary

8. Are the apples __________enough to eat yet?

A. mature

B. big

C. adult

D. ripe

9. Are you ________ when you say that you will help me?

A. honest

B. frank

C. sincere

D. profound

10. The introduction of gunpowder gradually made the bow and arrow _________, particularly in Western Europe.?

A obscure

B obsolete

C optional

D overlapping

参考答案：DBBDA，:CCDCB