[单选题]检修前，应确认与（ ）相关系统运行正常。
A.检修项目
B.检修设备
C.检修对象
D.检修线路

Most birds live in places where it is (36) during the day. They can use their (37) to see where they are (38) . The oilbirds of South America live in (39) caves. They use their ears to help them find their (40) .
The oilbird is a brown bird (41) owl-like eyes. It nests on a high ledge in an ink-black cave. It (42) leaves the cave at (43) to hunt for food and returns before (44)
The oilbird flies (45) circles in its dark cave. There is not enough (46) for it to see clearly with its large eyes. As the oilbird (47) , it uses its (48) to make sharp, clicking sounds. These
clicks bounce off the cave walls and (49) echoes.
The oilbird listens to the (50) it has made. If the echoes (51) a long time to come back, the bird knows it is (52) the wall. If they return (53) , the bird is close to it. (54) this way, the oilbird hea
A. walking
B. going
C. sleeping
D. staying

During the winter, most London auctioneers (拍卖商) have wine auctions. Some are of wines for (21) drinking, but most are of fine wines. Last winter, at Christies, a dozen bottles of Lafite 1945 were (22) down at ￡158 a bottle. 1945 and 1961 are the two most (23) vintage years for claret (红葡萄酒). Of course, that is not the maximum you could pay. Not (24) ago, an American at Christies paid ￡8,500 for one bottle of Lafite 1806.
Sometimes, it is a matter of personal (25) by the very rich. At other times there can be a (26) objective. Last October, a restaurateur from Memphis, paid ￡9,000 for a magnum—that is, a two-bottle size—of 1864 Lafite. He (27) 30 people ￡1,500 each for a dinner with a small glass of the wine. It was (28) ten times the cost of the wine in publicity for his restaurant.
Of course, some people buy wine purely for investment. On the other hand, a real wine lover will us
A. usual 
B. common 
C. daily 
D. everyday