问题 选择题
如图所示,理想变压器原、副线圈的匝数比为10:1,b是原线圈的中心接头,电压表V和电流表A均为理想电表.从某时刻开始在原线圈c、d两端加上交变电压,其瞬时值表达式为u=220sin100πt(V).下列说法正确的是(  )

A.当单刀双掷开关与a连接时,电压表的示数为22V

B.当单刀双掷开关与b连接时,电压表的示数为11V

C.当单刀双掷开关与a连接,滑动变阻器触头P向上移动的过程中,电压表的示数不变,电流表的示数变大

D.单刀掷开关由a扳向b时(滑动变阻器触头P不动),电压表和电流表的示数均变大

答案

答案:D

阅读理解

When Mr. David retired(退休),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 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

不定项选择题