【正确答案】 B

【答案解析】[听力原文]18-20
Mr. Grey had a nice shop in the main street of a small town. He sold diamond necklaces, watches, clocks and other such things. All went well for some years, and then Mr. Grey' s shop was broken into at night twice in one month, and a lot of diamond necklaces were sto len each time. The police had still not managed to catch the thief three weeks later, So Mr. Grey decided that he would try to do some thing about it. He bought a camera, fixed it up in his shop so that it could photograph anyone who broke in at night, and he put some very cheap diamond necklaces in front of it for the thief.
A few nights later the thief did come again, but he did not touch any of the cheap diamond necklaces that Mr. Grey had put out for him. He took the camera. It was worth $ 15 000.

【正确答案】 C

【正确答案】 A