问题 选择题

让我们想象一下,如果课堂上摩擦力突然消失,下列说法错误的是(  )

A.同学们稍微活动,就会从椅子上纷纷滑到地上

B.写字时铅笔从手中滑出,飘在空中

C.由于太滑,稍一用力,桌椅就会在地面上不停地滑动着,相互碰撞着

D.同学们将无法正常行走

答案

A、因为人和椅子的摩擦力消失,椅子和地面的摩擦力也消失,所以人稍微活动就会从椅子上滑落到地面上,故不符合题意;

B、手能在竖直方向上拿着笔是由于摩擦力的缘故,所以当摩擦力消失后,笔很容易从手中滑出,由于重力的原因会落在地上,即不会飘在空中,故符合题意;

C、稍一用力推桌子,由于桌子与地面间没有了摩擦;桌子就会在地面上不停地滑着、碰撞着;故不符合题意;

D、人在行走时就是依靠脚与地面的摩擦力进行的,所以当所有的摩擦力都消失了,同学们将无法正常行走,故不符合题意.

故选B.

阅读理解

The small coastal town of Broome, in northwest Australia, is a remote village in the vast countryside.

There are no traffic jams and hardly any roads. There is only the massive Australian wild land, where some houses are 500 miles apart and some driveways are 50 miles long.

There seem to be only two main sources of entertainment out here: the sunset at the beach and Sun Pictures.

Sun Pictures is a very different movie theater:The seats are park benches and deck chairs, but you’re also welcome to sit on the grass.

It is the world’s oldest outdoor movie garden. Sun Pictures was built in 1916 on the other side of the globe from Hollywood. All the big films were shipped here and the lonely country was amazed.

Broome resident Pearl Hamaguchi has never traveled far from home. But in the Sun Pictures chairs, under the deep blue night sky, she has been almost everywhere.

“And we came back excited about Gregory Peck,” she recalled.

This is one of the few places left in the world where you can see two sets of stars at the same time-----one set in the sky, the other in the film.

Each night, dozens of people from around the world line up at the old wooden stand, with no computer in sight, and buy their tickets to the latest films.

Sun Pictures is also a museum, exhibiting projectors(放映机) that date back to the silent films, a portrait gallery of the famous people who never knew about this place---- even though they came here all the time.

Every once in a while, I’m told, you might find a non-ticket holder in your seat. That’s why it’s always a good idea to shake out your chair to make sure there are no spiders or scorpions.

“We’ve only had a couple of scorpion incidents but no one’s been stung yet,” said Aaron Mestemaker, a tourist visiting from Michigan.

Sun Pictures is a holy hall of movie history and a reminder that air conditioning and carpet are no match for grass and fresh air---even when the lizards steal the scene.

小题1:. The first two paragraphs want to show that__________.

A.living in Broome is inconvenient

B.the life in Broome is boring

C.few people like to live in Broome

D.Broome is simple but vast小题2:.Sun Pictures is different from other theaters because _________.

A.it is the most historical outdoor theater in the world

B.the audience can either sit on chairs or on the grass

C.it was built by some constructor from Hollywood

D.all the films were imported here from Hollywood小题3:. Gregory Peck is most probably the name of_________.

A.a place

B.a film

C.a movie star

D.a country fellow小题4:. It can be inferred that the tourists in Broome are most attracted by ________.

A.its peacefulness

B.its beautiful sunset

C.the Sun Pictures

D.the gallery of movie stars

单项选择题