推进社区再就业相关对策有哪些？

在用电流表和电压表测定电池的电动势和内阻的实验图1中：

（1）移动滑动变阻器的滑动头应特别注意防止______．

（2）现备有以下器材：

A．干电池1个B．滑动变阻器（0～50Ω）C．滑动变阻器（0～1750Ω）D．电压表（0～3V）E．电压表（0～15V）F．电流表（0～0.6A）G．电流表（0～3A）

其中滑动变阻器应选______，电流表应选______，电压表应选______．（填写字母序号即可）

（3）图2是根据实验数据画出的U-I图象．由此可知这个干电池的电动势E=______V，内电阻r=______Ω．

我过四大渔场中，______最大．

Silence is unnatural to man. He begins life with a cry and ends it in stillness. In between he does all he can to make a noise in the world, and he fears silence more than anything else. Even his conversation is an attempt to prevent a fearful silence. If he is introduced to another person, and a number of pauses occur in the conversation, he regards himself as a failure, a worthless person, and is full of envy of the emptiest-headed chatterbox. He knows that ninety nine percent of human conversation means no more than the buzzing of a fly, but he is anxious to join in the buzz and to prove that he is a man and not a waxwork figure（蜡塑人像）.

The aim of conversation is not, for the most part, to communicate ideas; it is to keep up the buzzing sound. There are, it must be admitted, different qualities of buzz; there is even a buzz that is as annoying as the continuous noise made by a mosquito(蚊子). But at a dinner party one would rather be a mosquito than a quiet person. Most buzzing, fortunately, is pleasant to the ear, and some of it is pleasant even to the mind. He would be a foolish man if he waited until he had a wise thought to take pert in the buzzing with his neighbors.

Those who hate to pick up the weather as a conversational opening seem to me not to know the reason why human beings wish to talk. Very few human beings join in a conversation in the hope of learning anything new. Some of them are content if they are merely allowed to go on making a noise into other people’s ears, though they have nothing to tell them except that they have seen two or three new plays or that they had food in a Swiss hotel. At the end of an evening during which they have said nothing meaningful for a long time, they just prove themselves to be successful conversationists.

72. According to the author, people make conversation to _________.

A. exchange ideas                                      B. prove their value

C. achieve success in life                                   D. overcome their fear of silence

73. By “the buzzing of a fly” (Para. 1),the author means “_________”.

A. the noise of an insect                             B. a low whispering sound

C. meaningless talks                                         D. the voice of a chatterbox

74. According to the passage, people usually talk to their neighbors _________.

A. about whatever they have prepared         B. about whatever they want to

C. in the hope of learning something new    D. in the hope of getting on well

75. What is the author’s purpose in writing the passage?

A. To discuss why people like talking about weather

B. To encourage people to join in conversations

C. To persuade people to stop making noises

D. To explain why people keep talking

青少年应注意用眼卫生．下列各项中，不符合用眼卫生要求的是（　　）

A．读写姿势要正确

B．看书一小时后要远眺

C．认真做眼保健操

D．在昏暗或强光下看书

小王拟投资一商业房地产，假定该商业房地产的许可使用年限为38年，第1年末可以得到租金收入为50万元，年出租税金、维修及管理费用约为租金收入的20%，预计该市商业地产租金价格呈逐年上升趋势，按保守预测租金净收益年递增率2%，设定的资金成本为10%。在不考虑房产空置率情况下，试计算小王拟投资的商业房产的现时价值多少合适？已知（P/C，10%，2%，38）=11.791