问题 单项选择题

函数f(x)图形如图59所示,它的不可导点为( ).

答案

参考答案:D

解析: 显然左右导数不相等的点是x0,x2,x4,x6,故这些点是不可导点,选(D).

完形填空

Nowadays we can see more and more electric bikes in the street. Electric bikes are easy to  36  . They run fast and make no pollution. So they become very   37   in many big cities in China.

But the electric bikes also  38 more traffic accidents. So China plans to make a new rule

  39  the electric bike riders. If an electric bike is   40   than 40 kilos and can go faster than 20 kilometers an hour, its rider must get a   41 . It means riders have to pass driving tests  42 

they ride their electric bikes on the road.

People have different ideas about the plan.   43   welcome the plan because they think it will make the street much safer. But some are not   44   the new rules at all. One rider said, “I don’t want to get a license or anything. That’s too much   45 .” What’s your idea?

小题1:A. listen                       B. play                               C. ride

小题2:A. popular                     B. difficult                            C. strong

小题3:A. share                         B. cause                               C. protect

小题4:A. for                              B. to                                C. from

小题5:A. bigger                        B. heavier                             C. longer

小题6:A. license                      B. photo                             C. ID card

小题7:A. during                     B. after                                 C. before

小题8:A. None                          B. Some                              C. Each

小题9:A. happy with                  B. worried about                    C. sorry about

小题10:A. help                          B. pleasure                            C. trouble

问答题