问题 问答题 简答题

简述弯曲型河床的发育演化规律。

答案

参考答案:

在横向环流的作用下,弯曲型河床会发生凹岸被蚀后退,凸岸泥沙堆积前进。结果使得弯曲度越来越大,弯曲河床的上下游在弯曲颈部位直线距离越来越近。最后,可能在一次特大洪水期发生截弯取直,产生牛轭湖。

完形填空

阅读下面短文,根据以下提示:1)汉语提示,2)首字母提示,3)语境提示,在每个空格内填入一个适当的英语单词,并将该词完整地写在右边相对应的横线上,所填单词要求意义准确,拼写正确。

We may be very pleased with the rapid progress we

have made in every field of study. But we have almost done

nothing to       (改善)our present examination systems                           小题1:        

which focus on testing the students’ m        instead of                            小题2:        

their ability. As     as a child begins school, he enters                              小题3:        

a world of examination,        will decide his future of job.                       小题4:        

In fact a good examination system should     (鼓励)                                小题5:        

students to think for themselves.      the examination                                小题6:        

now does anything except that. It f      the students to                             小题7:        

remember what is taught to get     marks. Thus the students                      小题8:        

who come out first in the exam often may be the b                                 小题9:        

in their studies.       addition, such an examination system                        小题10:        

often drives teachers to take up all the time and forces them

to train students what to do with the coming examination.

I hope there must be a better way to test a student’s true

ability as well.

单项选择题 A3型题