题目内容
已知关系模式：sc(sno,sname,grade)，各属性含义依次为学号、课程名、分数。要查找“数据库”课分数最高的学生的学号，正确的SQL语句是()。
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One important new use for computers is for entertainment(娱乐). Many new games have been designed to be played on the computers. People of all ages have been playing these games. People also have been buying home computers to play computer games, watch movies and listen to concerts at home. They have become very popular indeed.
Computers used to ______.
About one hundred yards along the path we got to a deep valley, on the far side of which the path led into some very thick bushes. Rather than go through these, I decided that if we walked along the bottom of this valley we could climb up again and rejoin the path on the far side of the bushes.
As I climbed down into the valley a bird flew off a rock on which I had put my hand. On looking at the spot where the bird had risen I saw two eggs. They were a kind that I did not have in my collection, so I placed them carefully in my bag, wrapped in a little dry grass.
As we went further down the valley the sides became steeper and not far from where I had entered it. I came to a drop of about twelve to fourteen feet. The water that rushed down all these small valleys in the rainy season had made the rock as glass. As it was too deep to climb down, I handed my gun to one of the men and slid down it. My feet had hardly touched the sandy bottom when the two men jumped down, one on each side of me. They quickly gave me the gun and asked me if I had heard the tiger. Actually, I had heard nothing, perhaps because of the noise I made sliding down the rock. The men said they had heard a tiger growling somewhere nearby, but they did not know from which direction the noise had come.
According to the passage we know that ______.
It was not yet eleven o'clock when a boat crossed the river with a single passenger who was lucky to be able to cross the river at that unusual hour by promising to pay some extra money. While the youth stood in the light place searching his pockets for money, the boatman lifted a lamp, with the help of which, together with the newly risen moon, he took a careful look at the stranger. He was a young man of about eighteen years, clearly country brought up, and was, as it seemed, on his first visit to town. He was wearing a rough grey coat, which was in good shape, and which had seen many winters before this one. The jacket under his coat was made of leather(皮), and fitted tightly to a pair of strong legs; his stockings of blue must have been the work of his mother or sister; on his head was a hat, which in its better days had perhaps protected the grayer head of the young man's father, In his left hand was a walking stick, and on his strong shoulders hung a leather bag. Brown hair, well-shaped features(身体匀称), bright, cheerful eyes were nature's gifts. The youth, whose name was Robin, paid the boatman, and then walked forward into the town with a light step, as if he had not already travelled more than thirty miles that day. As he walked, he looked around as eagerly as if he were entering London or New York instead of the little city in New Eng land.
Which of the following statements is true？
By midday, the small party of boys, led by their schoolmaster, had reached a height of 2 500 feet. At this point the party had to stop climbing because one of the boys became seriously ill. The only thing the master could do was to return to the mountain hut where they had spent the night. From there, he telephoned the police. As no rescue party could reach the boy quickly enough, the Royal Air Force Rescue Center sent a helicopter with a policeman and a doctor on board. The helicopter soon arrived on the scene, but the sides of the mountain were so steep that it could not land. A helicopter usually lands on four wheels, but it can land on two. However, the slope was too steep even for that. The pilot, therefore, kept the helicopter in the air with only one wheel touching the mountainside while the party carried the boy on board.
The group of boys had to stop because ______.
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