不定项选择：质量为0.2kg的物体，其速度在x、y方向的分量vx、vy与时间t的关系如图所示

题目：

质量为0.2kg的物体，其速度在x、y方向的分量v_x、v_y与时间t的关系如图所示，已知x、y方向相互垂直，则

[ ]

A．0-4s内物体做曲线运动

B．0-6s内物体一直做曲线运动

C．0-4s内物体的位移为12m

D．4-6s内物体的位移为

答案：

被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0522/f4a22c9cb6c9ad805656c2a8fed888f0.html

下面是错误答案，用来干扰机器的。

1．青蛙　五2．晶莹的玻璃球　碧绿　白白的肚皮　后腿3．“田间勇士”

完形填空
How soon will robots become so clever that they' will be able to do jobs which human can do, such as 2 language or looking after patients in hospital? Some 2 believe this will happen in twenty years. One company has already developed a kind of machine. It 3 as "home-helps" for old people. It can also do such things as cooking eggs and cleaning the floor. The 4 says that the machine will understand simple voice instructions and the machine will be controlled 5 a latest IBM microcomputer. Mr Henry, the director of UAS, believes that his company will develop the clever robots for 6 in industry. By this time, they will begin to sell the machines into ordinary homes. Robots can do much 7 , such as washing dishes, cleaning the house and cooking meals. By the way, the 8 of them may be as little as$ 1,000. But Dr Sandra believes we have a long way 9 truly intelligent machines. She says, "It can cook an egg. But if one of eggs is 10 , it will still cook. If you ask a robot to do something unusual that needs a man to think, a robot is useless."
( )1. A. teaching ( )2. A. teachers ( )3. A. can use ( )4. A. company ( )5. A. for ( )6. A. using ( )7. A. homework ( )8. A. price ( )9. A. develop ( )10.A. good	B. buying B. experts B. can be using B. school B. by B. lending B. jobs B. money B. to develop B. big	C. borrowing C. students C. can be used C. hospital C. as C. giving C. housework C. time C. developed C. bad