问题
选择题
河流一般形成在（ ）
A．山谷
B．缓坡
C．山脊
D．陡坡
答案
答案：A
题目分析：山谷的等高线向高处凸出，实际形态是两山间低凹而狭窄处，所以山谷一般容易发育成河流。
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河流一般形成在（ ）
A．山谷
B．缓坡
C．山脊
D．陡坡
答案：A
题目分析：山谷的等高线向高处凸出，实际形态是两山间低凹而狭窄处，所以山谷一般容易发育成河流。
The three superstars were arriving at the airport and a large crowd of young people had already gathered there to welcome them．The police found it 36 to keep order after the plane landed and the performers 37 ．They smiled and waved cheerfully at everybody．Dressed in the same pink shirts and light blue trousers, with long hair and musical instruments over their shoulders, they all looked 38 ． Although there were many policemen 39 , the Blare were not able to get to their waiting car _40__ at all. Word spread that they had composed a new song which would be _41 when they performed at the concert that evening．They were now 42 _ with loud cries of " Play your new song! Play your new song!" When the stars prepared to sing as the 43 for getting away, even the policemen looked 44 , too. The fans settled down and listened to the first 45 _ of the new song．Once it was over, everyone started jumping, clapping and shouting _46 . Several young women even fainted（昏倒） with excitement and were carried away immediately by the 47 standing by. The fans were greedy for more, 48 a repeat performance．Once again, the performers had no choice but to 49 , but when they were asked for still another song, they cheerfully but firmly refused．Closely 50 by the policemen, they walked towards their car some distance 51 . The fans pushed forward, but the policemen, _ 52 arm, prevented anyone getting trough. It took the stars quite a long time to reach their 53 ! Finally, however, they all got in and were just about to leave when a young woman, who had somehow 54 to get past the policemen, jumped onto the roof of the car．She shouted loudly and crazily as two policemen dragged her away and the car started to move very slowly through the 55 crowd．She had just wanted to have a photo taken with the stars !
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