取得证券、期货投资咨询从业资格的人员申请执业的，由（）颁发执业证书。 A.中国证监会

You          drive your car so fast. It’s dangerous.

A．wouldn’t

B．shouldn’t

C．couldn’t

D．mightn’t

80.It was not until 1920 ______ regular radio broadcasts began.

A．while　　　

B．which　　　　

C．that　　　　

D．since

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

     There were times when it was only schoolchildren who felt sick before they got their grades. 1_____

     Many teachers are opposed to it. They don't mind being evaluated. But they are upset because the results

are then being posted on the Internet and accessible to millions of Internet users. 2_____ The teachers are

graded on categories such as "motivated", "good instruction", "easy examinations", or even "sexy". 3_____

     The creators of the website say that the students are only being offered the chance to provide teachers

with some feedback (反馈) about their classroom instruction. Bemd Dicks founded the website with three

friends. 4_____ On a grading scale of one to six, the teachers' average grade is as high as 2.7 and it has been

improving lately. He often says the impression is that students are bullying (欺负) their teachers. But there is

also bullying of the students by teachers.

     "Teachers must also learn to live with criticism," he added. But still, the website is not totally prevented

from being manipulated (人为操纵), as one teacher near the northern city of Hanover recently proved. 5_____

Within a few days, seven of his colleagues were listed in the top 10 rankings of Germany's best teachers.

A. On the website www.spickmich.de during the past four months students have posted evaluations of 100 000

    teachers.

B. He registered himself on the website as a student and then rated his own teaching colleagues highly.

C. Many teachers think that their privacy has been disturbed.

D. But now teachers in Germany are scared, too, as they are being.graded by their students.

E. He says that the students are largely quite satisfied with their teachers.

F. He says a majority of the students expressed their dissatisfaction with their teachers.

G. He tried to make friends with students as many as possible.

据报道，华中农业大学的几位学生发明了一种水面垃圾清理船，它能将水面上漂浮的垃圾通过前端的两个旋转滤网收集后，由倾斜的传送带送至船尾的垃圾箱中，如图是设计的样船．若相关数据如下表：

（1）工作前，质量为60kg的驾驶员登上船后，它排开水的体积是多少？

（2）正常工作时，传送带将收集的垃圾升高0.5m后，落入垃圾箱中，这要消耗发动机的1%的能量．它在5分钟内可传送300kg的垃圾，求传送带的传送效率．

（3）如何提高该船效率，请提出一条合理的建议．

影响开挖边坡稳定性的因素是什么？如何防止边坡失稳？