呼吸道常见真菌除下列哪项（） A.白假丝酵母菌 B.隐球菌 C.曲霉菌 D.毛霉菌

下面关于串行通信的叙述中，错误的是：

A．异步通信时，起始位和停止位用来完成每一帧信息的收发同步

B．二进制数据序列在串行传送过程中，无论是发送还是接收，都必须由时钟信号对传送数据进行定位

C．串行通信有单工、半双工和全双工三种方式

D．对传送数据进行校验时，如果发送方按偶校验产生校验位，那么接收方可按偶校验进行校验，也可按奇校验进行校验

阅读下面短文，按照要求回答问题(共5小题；每小题3分，满分15分)

The Monster of Lake Tianchi

The "Monster of Lake Tianchi" in the Changbai Mountains in Jilin province, northeast China, is back in the news after several recent sightings. The director of a local tourist office, Meng Fanying, said the monster, which seemed to be black in colour, was ten metres from the edge of the lake during the most recent sighting. "It jumped out of the water like a seal—about 200 people on Changbai's western peak saw it," he said. Although no one really got a clear look at the mysteriouscreature, Xue Junlin, a local photographer, claimed that its head looked like a horse.

In another recent sighting, a group of soldiers claim they saw an animal moving on the surface of the water. The soldiers, who were walking along the side of the lake, watched the creature swimming for about two minutes. "It was greenish-black and had a round head with 10-centimetre horns", one of the soldiers said.

A third report came from Li Xiaohe, who was visiting the lake with his family. He claims to have seen a round black creature moving quickly through the water. After three or four hundred metres it dived into the water. Ten minutes later the monster appeared again and repeated the action. Mr Li Xiaohe said that he and his family were able to see the monster clearly because the weather was fine and the lake was calm.

There have been reports of monsters in Lake Tianchi since the beginning of the last century, although no one has seen one close up. Some photos have been taken but they are not clear because it was too far away. Many people think the monster may be a distant cousin of the Loch Ness monster in Scotland. They also think that there might be similar creatures in other lakes around the world. Scientists, however, are sceptical. They say that the low-temperature lake is unlikely to be able to support such large living creatures.

Lake Tianchi is the highest volcanic lake in the world. It is 2,189 metres high and covers an area of about ten square kilometres. In places it is more than 370 metres deep.

76. How many sightings of the monster does the article report?

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77. Who saw the monster clearly, and why?

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78. Which description of the monster is most detailed?

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79. When was the monster first sighted?

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80. What is special about Lake Tianchi?

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碳的结构只有石墨和金刚石。

“进口日期”栏应填（）。

A．2000.05.12

B．2000.05.18

C．2000.05.22

D．2000.05.28