题目

探究响度与什么因素有关器材：音叉，橡皮槌，铁架台，硬泡沫塑料小球，细线等。操作： （1） 用细线栓在硬泡沫塑料小球，悬挂在铁架台上，小球的作用是 （2） 用橡皮槌轻轻敲击音叉使它振动后，发出一个较小的声音。让音叉一臂的外侧靠近并接触小球（如图），可以看到小球被音叉弹开一个（填“较大”或“较小”)的角度； （3） 以橡皮槌用力敲击音叉，可听到较响的声音，且让音叉一臂的外侧接触小球，可看到小球被音叉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 surprise, many visitors came to see his house in summer holidays, for it was the most interesting building in the village. From morning to night, there were visitors outside the house. They kept looking into the rooms through the windows and many of them even went into the house. He decided to drive the visitors away. So he put a notice (公告)on the window. The notice said, “If you want to satisfy your curiosity(好奇心),come in and look around. 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.1.Mr. David’s house was      that many visitors came to see it.A.so smallB.so quietC.so interestingD.such interesting2.Mr. David put a notice on the window in order      .A.to drive the visitors awayB.to satisfy the visitors curiosityC.to let visitors come in and look aroundD.to get some money out of the visitors3.The notice made the visitors      .A.more interested in his houseB.lost interest in his houseC.angry at the unfair priceD.feel happy about the price4.After Mr. David put up the notice      .A.the visitors didn’t come any moreB.fewer and fewer visitors came to see his houseC.more and more visitors came for a visitD.no visitor would pay the money for a visit5.At last he had to sell his house and move away because       .A.he did not like it at allB.he could not work as a guideC.he made enough money and wanted to buy a new expensive houseD.he could not live a quiet life in it