问题 选择题

研究发现,长江干流江苏段河床在1985年前后平均冲淤状态发生了明显的转变,由淤积转变为冲刷。其主要原因是[ ]

A.该河段平均流速下降

B.该河段径流量减少

C.流域年降水量减少

D.上游来沙量减少

答案

答案:D

材料分析题

材料一:小利看到有人抽烟,于是也想尝一口。从此,常偷家里的钱买烟抽,他觉得这样在同学面前特有面子。

材料二:民民自小爱下象棋,星期天、节假日喜欢跟人下象棋。

(1)材料一二分别属于什么情趣?这两类情趣分别对人有怎样的影响?

                                                                                                                                                              

                                                                                                                                                             

                                                                                                                                                            

(2)在生活中,我们应怎样追寻高雅的生活?

                                                                                                                                                           

                                                                                                                                                          

                                                                                                                                                           

多项选择题