数字签名是解决（）问题的方法。A、未经授权擅自访问网络 B、数据被泄漏或篡改 C、冒

某中学研究性小组拟出一期题为“走进京剧”的墙报。同学们就栏目标题提出四组方案，其中准确的是

A．乾嘉落户同光扬名民族瑰宝

B．戏曲之祖生旦净丑曲苑奇葩

C．元末初创京城献礼声名鹊起

D．四大徽班康乾京华独领风骚

—Why didn’t you tell him about the meeting?

—He rushed out of the room _____ I could say a word.

A．before

B．until

C．when

D．after

One afternoon after school had finished , Peter and Jane were walking along the street. Suddenly they heard a big noise.

“Come on” shouted Peter.“That sounds like an accident. Let’ see what’s happened.”

They ran to where the noise came from. As soon as they got there, they could see what had happened. A small car had knocked into the side of a truck. The accident had happened in a quiet street with only four houses in it. Peter and Jane were the first ones to reach the site. No other people came.“We must be the only ones who saw the accident,” said Jane. They found that both the car driver and the truck driver were hurt.

“Peter,” said Jane,“ Run back down the road to Mrs Day’s house. Ask her to call the policemen and the ambulance. Hurry. I’ll stay here.”

Off went Peter as fast as he could. There was nothing Jane could do but wait. She knew that when people were hurt in an accident, they shouldn’t be moved. It wasn’t long before the police car and the ambulance arrived. The policeman got the car door open and they carried the man out. Then they got the truck driver out. The men weren’t seriously hurt, but they were both taken to the hospital. The policemen thanked Peter and Jane, “You were very good to act so quickly when you saw the accident. Thank you for all your help.”

67.The accident happened _______.

A. in a quiet street one school day afternoon

B. in a busy street one school day afternoon

C. in a quiet street one Sunday after noon

D. in a busy street one Sunday afternoon

68. ______in the accident.

A. Only the car driver was hurt        B. Only the truck driver was hurt

C. Neither of the two drivers was hurt   D. Both the drivers were hurt

69._____called the policeman.

A.Jane  B.The drivers   C. Mrs Day    D. Peter

70.Jane did nothing before the policemen arrived because _____.

A. she was too frightened to do anything   B. she was alone after Peter left

C. she was waiting for Peter

D. she knew she shouldn’t move the two drivers

用气体渗漏试验空调压缩机，通过充填阀向空调压缩机充入制冷剂的压力需要达到（）MPa。

A．0.294

B．0.101

C．0.402

“阴病治阳”的含义是：

A．阳中求阴

B．阴中求阳

C．补阴以制阳

D．补阳以制阴