题干

关于运动和静止,下列说法错误的是(  )

A:拖拉机和联合收割机以同样的速度前进时,以拖拉机为参照物,联合收割机是静止的

B:站在正在上升的观光电梯上的乘客认为电梯是静止的,是因为他以身边的乘客为参照物

C:站在地球上的人觉得地球同步通信卫星在空中静止不动,是因为他以自己为参照物

D:飞机在空中加油时若以受油机为参照物,加油机是运动的

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答案(点此获取答案解析)

D

同类题1

根据短文内容, 从下面方框内的七个选项中选出五个还原到短文中, 使原文句子通顺, 结构完整。

A. He also wrote the sport's official rules.

B. Soccer is the world's favorite sport.

C. Playing soccer is good for your health.

D. But one reason is how simple the sport is.

E. People love soccer as well as their countries.

F. It's hard to say where soccer's birthplace is.

G. Soccer performances are pleasing to the eyes.

    ____ It has around 3 billion fans—nearly half the world's population! And about 300 million people play this game. That's 4 percent of the world's population!

    ____ Many people in old days played the early form of this modern game. Cuju(蹴鞠), a ball-kicking game in China, was reported as early as 2, 500 B. C.  Around the same time in Greece, people were also playing a similar ball game without using their hands.

But modern soccer didn't become official(官方的)until 1863. An Englishman called Cobb Morley introduced the idea of a soccer association(联盟). ____ From then on, other associations in the countries were set up. They came together—to make up the FIFA, which organizes the World Cup.

It's not easy to tell what makes soccer so popular. ____ Soccer needs only two feet and a ball. This makes it a sport that developing countries can play easily. Some of the sport's best players come from these poor nations. 

    ____ The sport's no-hands rule makes beautiful dance—like movements on the field. What's more, this sport excites the heart. Teams might score only a few times each match, so matches can turn around suddenly.

     No one knows who will win at the next World Cup. But one thing is certain: The world will be watching.