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问题 单项选择题

使用下列哪个选项可以调用基类中的特定构造方法

A．一对一

B．多对一

C．一对多

D．多对多

答案

参考答案：C

解析：一般情况下，垂直滚动条的值由上往下递增，最上端代表最小值，最下端代表最大值；水平滚动条的值从左到右递增，最左端代表最小值，最右端代表最大值。因此选项B)是正确的。

填空题

计算公式：P=______，从公式可以看出，液体压强只跟液体的______和______有关，而与液体的体积、重力及盛装液体的容器形状无关．
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单项选择题

Mr. Peter Johnson, aged twenty-three, battled for half an hour to escape from his trapped car yesterday when it landed upside down in three feet of water. Mr. Johnson took the only escape route—through the boot.
Mr. Johnson’s car had finished up in a ditch at Romney Marsin, Kent after skidding on ice and hitting a bank. "Fortunately, the water began to come in only slowly, " Mr. Johnson said. "I couldn’t force the doors because they were jammed against the walls of the ditch and dared not open the windows because I knew water would come flooding in. "
Mr. Johnson, a sweet salesman of Sitting Home, Kent, first tried to attract the attention of other motorists by sounding the horn and hammering on the roof and boot. Then he began his struggle to escape.
Later he said, "It was really a half penny that saved my life. It was the only coin I had in my pocket and I used it to unscrew the back seat to get into the boot. I hammered desperately with a hammer trying to make someone hear, but no help came. "
It took ten minutes to unscrew the seat, and a further five minutes to clear the sweet samples from the boot. Then Mr. Johnson found a wrench and began to work on the boot lock. Fifteen minutes passed by. "It was the only chance I had. Finally it gave, but as soon as I moved the boot lid, the water and mud poured in. I forced the lid down into the mud and scrambled clear as the car filled up. "
His hands and arms cut and bruised, Mr. Johnson got to Beckett Farm nearby, where he was looked after by the farmer’s wife, Mrs. Lucy Bates. Huddled in a blanket, he said, "That thirty minutes seemed like hours. " Only the tips of the car wheels were visible, police said last night. The vehicle had sunk into two feet of mud at the bottom of the ditch.

Which statement is true according to the passage

A. Mr. Johnson’s car stood on its boot as it fell down.
B. Mr. Johnson could not escape from the door because it was full of sweet jam.
C. Mr. Johnson’s car accident was partly due to the slippery road.
D. Mr. Johnson struggled in the pouring mud as he unscrewed the back seat.
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