问题 选择题

理想实验是科学研究中的一种重要方法,如图所示的是根据可靠的事实进行的斜面理想实验和推论的示意图,这个实验工作曾得到了爱因斯坦的高度评价.是哪位科学家根据这个实验工作推翻了“力是维持物体运动的原因”的观点(  )

A.牛顿

B.伽利略

C.安培

D.亚里士多德

答案

A、牛顿系总结了前人的经验,并通过大量的实验提出了牛顿三大定律,是力学的奠基人,故A错误;

B、伽利略通过理想斜面实验得出了力不是维持运动的原因,而是改变物体速度的原因,故B正确;

C、安培在电磁学的研究中发挥了重要作用,被称为电磁学之父,故C错误;

D、亚里士多德认为运动需要力来维持,故D错误;

故选B.

问答题
阅读理解

阅读理解。

     In many countries the standard of living enjoyed by their people has increased rapidly in recent years.

Sadly, not everyone in these countries is so fortunate and many people in rich countries are homeless.

     The reasons for homelessness are various, but poverty (贫穷) is undoubtedly one of the main causes.

The homeless people may have become jobless and then been unable to pay their rent and so no longer

have a roof over their heads. Often, the fact that unemployed people get help from the government prevents

this from happening, but not always.

     Some homeless people are mentally ill and have no one to look after them. Some are young people who,

for one reason or another, have left home and have nowhere to live. Many of them have had a serious

disagreement with their parents and have left home, choosing to go to a city and live on the streets. Sometimes

they have taken such action because they have been unable to get on with a step-parent.

     Many homeless people get into the habit of begging to get enough money to stay alive, but many of the

general public refuse to give anything to beggars. Often they are moved on by the police, being accused (指

控), whether rightly or wrongly, of forceful begging. There are many who disrespect homeless people.

     Some cynics (愤世嫉俗的人) declare that homeless people choose to live the life which they lead. But

who would willingly choose to live in z shop doorway, under a bridge or in a cardboard box?

1. According to the text, what causes some people to be homeless?

A. Lack of money.

B. The increased standard of living.

C. No government help.

D. Agreement with their parents.

2. It can be inferred from the text that _____.

A. the homeless are willing to live under a bridge or in a cardboard box

B. you will not find homeless people in countries with a high standard of living

C. the mentally ill live on the stress because they want the company of other homeless people

D. the unemployed who receive help may still be among the homeless

3. In paragraph 2, "a roof over their needs" most probably means _____.

A. a cap

B. a car

C. a home

D. a covering

4. The author thinks that the homeless people are _____.

A. pitiful

B. troublesome

C. respectable

D. admirable