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【简答题】
Now, there is a growing movement to pay the students in American schools---in some cases, even just for coming to class. Students at one school in New Mexico can earn up to three hundred dollars a year for good attendance. In Baltimore, Maryland, high scores in state graduation tests can be worth more than one hundred dollars. And a New Jersey school system plans to pay students fifty dollars a week to attend after---school tutoring programs. Schools that pay students can be found in more than one---fourth of the fifty states. Other schools pay students with food or other rewards. Robert Schaefer is a public education director. He says paying students may improve performance in the short term, but students develop false expectations for the future. He sees a lack of long term planning in these programs because of the pressure on schools to raise test scores. Public schools need to show improvement under the education reform law. Low---performing schools may lose their federal money; teachers and administrators(行政人员) may lose their jobs. Often these schools are in poor neighborhoods where getting students to go to school can be a continual problem. Critics(评论家) say paying students sends a message that money is the only valuable reward. But some students say it makes school more exciting. And some teachers have reported getting more requests for extra help. In two thousand four, the city schools in Coshocton, Ohio, launched a program. They wanted to see if paying elementary school students as much as one hundred dollars would help in passing the state exams. Now, Eric Bettinger of Case Western Reserve University (EUCWRU) has reported mixed results. Math scores increased, but only white students were able to get paid. And there was no evidence of higher scores in reading, social studies and science. Official will decide later this year whether to continue the program. 小题1:Paying students who show improvement in tests __________. A.has been done in most American schools B.is becoming a growing practice in the USA C.is not very popular with teachers D.only aims at high scores at school 小题2:According to the text, Robert Schaefer _____________. A.is a very excellent teacher B.thinks highly of paying students C.thinks students will show improvement in study in the future D.thinks people should make a careful plan for the paying program 小题3:From the last paragraph we can see __________. A.EBCWRU has got great success in its paying program B.not all the students in EUCWRU have made progress in all subjects C.only students who study math can get paid D.EBCWRU will go on with the paying program 小题4:The text is mainly written to _____________. A.persuade teachers to give students more prizes B.tell people how to become an excellent student C.introduce something about American paying students program D.explain the advantages of American paying students program
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【单选题】237·直流电机旋转时, 电枢绕组元件从一个支路经过电刷转换到另一个支路, 元件中的电流方向改变( )。
A.
(A)0 次
B.
(B)1 次
C.
(C)2 次
D.
(D)4 次
【单选题】刺激B细胞产生抗体时需要Th细胞辅助的抗原是
A.
自身抗原
B.
非T细胞依赖性抗原
C.
异种抗原
D.
T细胞依赖性抗原
E.
半抗原
【单选题】运转中,无特殊情况一般不能停机,避免重载启动。停机后,如因负荷过大,连续启动2~3次(每次启动时间不得超过()秒),仍不能启动,要及时通知有关人员卸载,当确认卸载量适度时,再试开。
A.
15
B.
30
C.
45
D.
60
【单选题】刺激B细胞产生抗体时需要Th细胞辅助的抗原是
A.
自身抗原
B.
非 T 细胞依赖性抗原
C.
T细胞依赖性抗原
D.
半抗原
【判断题】France is a country famous for rivers,cars,and beers.
A.
正确
B.
错误
【单选题】运转中,()停机,避免重载启动。停机后,如因负荷过大,连续启动2~3次(每次启动时间不得超过15秒),仍不能启动,要及时通知有关人员卸载,当确认卸载量适度时,再试开。
A.
可随意
B.
严禁
C.
无特殊情况一般不能
D.
禁止
【简答题】照相用的废定影液中含有Na + 、[Ag(S 2 O 3 ) 2 ] 3 - 、Br - 等离子。某研究性学习小组拟通过下列实验程序,对某照相公司的废定影液进行实验处理,回收其中的银和溴。 (已知:4H + +2 [Ag(S 2 O 3 ) 2 ] 3 - = Ag 2 S↓+3S↓+3SO 2 ↑+SO 4 2 - +2H 2 O) ⑴操作Ⅲ的名称是 ;操作Ⅱ需要的主要玻璃仪器有 。 ⑵加入锌粉...
【单选题】运转中,无特殊情况一般不能停机,避免重载启动。停机后,如因负荷过大,连续启动()次(每次启动时间不得超过15秒),仍不能启动,要及时通知有关人员卸载,当确认卸载量适度时,再试开。
A.
1~2
B.
2~3
C.
3~4
D.
4~5
【单选题】以下哪种说法是正确的( )
A.
每次启动时间不得超过30秒
B.
如果发动机启动失败,必须把启动开关转到“OFF”位臵才可以再次启动,则 会损坏启动开关
C.
两次启动之间至少需要15秒
D.
连续启动次数不得超过5次
【简答题】用启动马达启动时,待发动机启动后,立即放松离合器踏板。使用启动马达每次不得超过(),再次启动间隔不得少于()。启动后严禁立即猛轰油门,待其怠速运转()后,方可起步。
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