二、单选 (20分)
21. His mother opened the drawer to __________ the knives and spoons.
A. put away B. put up C. put forward D. put together
22. Mr. Green stood up in defence of the 16-year-old boy, saying that he was not the one ______.
A. blamed B. blaming C. to be blamed D. to blame
23. Finding information in today’s world is easy. The _________is how you can tell if the information you get is useful or not.
A. ability B. competition C. knowledge D. challenge
24. ____________ to nuclear radiation, even for a short time, may produce variants(变体) of genes on human bodies.
A. Being exposed B. Having exposed C. Exposed D. After being exposed
25. ---What’s the general idea of the passage, Bob?
