问题 问答题

利用速度传感器与计算机结合,可以自动作出物体运动的图象.如图所示,是某次实验中得到的小车运动的部分v-t图象,由此可以知道小车在第1s内发生的位移大约是______.

答案

如图一个小正方形“面积”s1=0.1×0.1m=0.01m.在1s范围内,正方形的个数为60个,总“面积”为S=60s1=0.6m.所以小车在第1s内发生的位移大约是0.6m.

答:小车在第1s内发生的位移大约是0.6m.

填空题
阅读理解

Let’s say you have a piece of wood, a nail, and a hammer. Pretend the wood is a person, and the nail is a mean rumor(谣言) about that person. If you hammer in the nail, you’re obviously hurting him or her. If you then pull out the nail, there’s still a hole in the wood, and the damage has been done.

There are many reasons why that nail of a rumor can be so harmful. Rumors are, quite simply, a form of bullying(欺侮). When a person or a group makes up a rumor about someone or decides to spread gossip, it’s usually to hurt someone, break up a friendship, or make someone less popular. It’s the same thing as teasing, only it’s done behind someone’s back instead of to his or her face.

When you spread a rumor about someone, you’re sending a signal that the person is outside of the group, and somehow less worthy of friendship than others. You’re making fun of that person or pointing out negative things about him or her. This can let others think that it’s okay to make the person feel bad, and make him or her an outsider.

We need to be able to trust our friends, and gossip and rumors can break this trust. If you tell a personal secret to a friend, and he turns around and tells it to someone else, you might feel like you will get burned if you ever get close to him again.

Letting a rumor influence your behavior is like letting someone else make a big decision for you. Let’s say you hear that the teacher plans to call a Snow Day tomorrow because a blizzard (暴风雪) is coming. Expecting a day off, you don’t do your homework. The next morning, the blizzard turns out to be nothing more than a drizzle(毛毛雨), and school isn’t off after all. You get zeroes on your work.

小题1:To tell a rumor and a tease apart, you depend on ______.

A.whether it is done behind someone

B.whether it is painful or not

C.whether it is a kind of bullying

D.whether it is spread fast.小题2:If a rumor is spread about someone, others may_______.

A.point out his or her advantages

B.keep away from him or her

C.not feel he or she is an outsider

D.be hurt if getting close to him or her again.小题3:The purpose of this passage is to _______.

A.advise on how to deal with rumors

B.teach us how to judge a rumor

C.find out why rumors spread fast

D.explain why rumors hurt