问题 问答题

某同学在做平抛运动实验时得到了如图所示的物体运动轨迹,a、b、c三点的位置在运动轨迹上已标出,则:

(1)相邻两点间的时间间隔为______s;

(2)小球平抛的初速度为______m/s.

答案

(1)在竖直方向上有:△y=gT2,解得T=

△y
g
=
0.1
10
s=0.1s.

(2)平抛运动的初速度v0=

x
T
=
0.2
0.1
m/s=2m/s.

故答案为:(1)0.1(2)2

完形填空

Many Chinese students don’t pay much attention to spoken English at school. They think it necessary to practice   36  English in class, but not   37  class. Here is a story to show you   38  important it is to speak the English language freely in everyday life.

A foreigner once   39  hungry and went into a restaurant in London. He sat down at a table. When the waiter came, he   40  his mouth, put his fingers into it and took them out again in order to   41  that he wanted something   42  because he could not speak English. The waiter soon   43  him a cup of tea. The man shook his head. The waiter then took   44  the tea and gave him a cup of coffee. Still the man didn’t   45  what he wanted. He tried again and again, but he wasn’t able to make the waiter   46  him. Finally   47  man came in. He spoke English   48  and fluently. After a few minutes, there was a large plate of meat and vegetables on the table in front of   49  .

So you see a man can go hungry if he   50  master(掌握)a foreign language.

小题1:A. speak                       B. speaking                 C. to speak

小题2: A. outsider                   B. out                      C. out of

小题3: A. how                        B. how an                   C. what an

小题4: A. get                        B. gets                     C. got

小题5:A. open                       B. opened                   C. opens

小题6: A. express                        B. expressed                    C. expressing

小题7:A. eats                        B. eating                       C. to eat

小题8:A. took                        B. brought                  C. bought

小题9:A. away                        B. out of                       C. down

小题10:A. make                        B. give                     C. get

小题11: A. understand                 B. understood                   C. be understood

小题12:A. other                       B. the other                    C. another

小题13:A. clean                       B. clear                        C. clearly

小题14:A. he                          B. him                      C. his

小题15:A. doesn’t                        B. won’t                       C. isn’t

单项选择题