微波是一种具有高频率的电磁波，波长很短。利用微波可进行远距离通信，下列（）为微波通信

When Mr. David retired, he bought a small house in a village near the sea. He liked it and hoped to live a quiet life in it.

But to his great surprise, many tourists（游客）came to see his house in summer holidays, for it was the most interesting building in the village. From morning to night there were tourists outside the house. They kept looking into the rooms through the windows and many of them even went into Mr. David’s garden. This was too much for Mr. David. He decided to drive the visitors away. So he put a notice on the window. The notice said: “If you want to satisfy your curiosity（好奇心）, came in and look round. Price: twenty dollars.” Mr. David was sure that the visitors would stop coming, but he was wrong. More and more visitors came and Mr. David had to spend every day showing them around his house. “I came here to retire, not to work as a guide（导游）.” he said angrily. In the end, he sold the house and moved away.

小题1:Mr. David’s house was_______ that many tourists came to see it.

A．so small

B．so quiet

C．so interesting

D．such interesting小题2:Mr. David put a notice on the window in order_______.

A．to drive the visitors away

B．to satisfy the visitor’s curiosity

C．to let visitors come in and look round

D．to get some money out of the visitors小题3:The notice made the visitors _______.

A．more interested in his house

B．lost interest in his house

C．angry at the unfair price

D．feel happy about the price小题4:After Mr. David put up the notice_______.

A．the visitors didn’t come any longer

B．fewer and fewer visitors came to see his house

C．more and more tourists came for a visit

D．no tourist would pay the money for a visit小题5:At last he had to sell his house and move away because_______.

A．he did not like it at all

B．he could not work as a guide

C．he made enough money and wanted to buy a new expensive house

D．he could not live a quiet life in it

下列叙述正确的是______。

A．同一关系内部属性之间不存在引用关系

B．外码一定要与相应的主码同名

C．同一个关系中不允许出现完全相同的元组

D．同一个关系中主码的值可以相同

关于样品采集和保存，下列哪一项表述是不正确的（）。

A.粮食及固体食品应自上、中、下三层中的不同部位分别采样混合

B.罐头、瓶装食品或其他小包装食品不同批号取样件数不少于3个

C.液体、半流体饮食品应先混匀后再采样

D.采样必须注意样品的生产日期、批号、代表性和均匀性

E.采集数量应满足检验项目对样品量的需要，一式三份，每份不少于0.5kg

根据《中华人民共和国会计法》的规定，对伪造，变造会计凭证，会计账簿，编造虚假财务会计报告的直接负责人员，可以处（ ）罚款。

A．2000元以上5000元以下

B．3000元以上5000元以下

C．3000元以上20000元以下

D．2000元以上20000元以下