A．acknowledgedB．authorizedC．boundD．credited

A. acknowledged
B. authorized
C. bound
D. credited

A．regulationB．executionC．prosecutionD．disposition

A. regulation
B. execution
C. prosecution
D. disposition

We learn from Paragraph 2 that the idea of evolution through natural selection ______.

A. had arisen long before the publication of Origin
B. was less influential than generally supposed
C. was shared by some of Darwin"s contemporaries
D. originated from geological evidences and fossil records

You and some of your classmates decide to go for an outing to the Summer Palace during the

The bedroom is in a terrible mess; it______cleaned.

A. can"t have been
B. shouldn"t have been
C. mustn"t have been
D. wouldn"t have been

I______the meeting yesterday, but some urgent matter prevented me from coming.

A. ought to attend
B. was about to attend
C. was to have attended
D. was to attend

We may learn from paragraph 2 that it centers on______.

A. the causes of the America"s economic expansion
B. the stimulative monetary and fiscal policies
C. the restoration of sounder liquidity positions
D. the President"s economic policy moves

What can we learn from the passage？

A. People can hardly get Vitamin D from daily diet.
B. Heavy use of sunscreen can promote the Vitamin D production by the body.
C. The Vitamin D density is strengthened in milk and bread.
D. The standard amount of Vitamin D intake keeps no change for kids and adolescents.

A．deviateB．fluctuateC．differentiateD．segregate

A. deviate
B. fluctuate
C. differentiate
D. segregate

When enough of the tree ______chopped away, the tree falls.

A. is
B. have
C. was
D. were