问题 选择题

发现电流的磁效应的科学家是(    )

A.库仑

B.奥斯特

C.法拉第

D.安培

答案

答案:B

题目分析:1820年,丹麦物理学家奥斯特发现,导线通电后,其下方与导线平行的小磁针发生偏转,这种现象说明通电导线周围产生了磁场。

故选B

点评:容易题。本实验要想实验现象明显应把导线南北放置。把导线沿南北方向放置在地磁场中处于静止状态的磁针的正上方,通电时磁针发生明显的偏转,是由于南北方向放置的电流的正下方的磁场恰好是东西方向。

阅读理解

补全下列句子,每空词数不限。

     Nowadays, a new term called SAHDs (stay-at-home dads) is becoming very popular. In the UK, there are 600,000 men who stay at home as full-time husbands. The number is 10 times more than 10 years ago. In the USA, there are at least 1.7 million unemployed (失业的) married men who depend on their

wives.      

     SAHDs have increased in number around the world. There are three reasons to explain this.

     First, the bad economic situation (经济形势) has caused the decline (衰退) in men’s traditional

working fields, which has led to a large number of unemployed people.

     Second, the social and cultural progress provides a possibility for such a change in families.

     Third, the improvement in women’s education has also given them the chance to show their talents in

work. Therefore, women are able to support their families.

     According to a survey in the UK, most stay-at-home fathers said the reason for this was that the

mother made more money. The survey also suggested the men that stayed at home were happier with this

than the women, with 75% of fathers saying they were lucky to spend so much time with their children.

1. In the UK, the number of ___________________ is 10 times more than 10 years ago.

2. The numbers in the first paragraph are used to support the fact that _________________.

3. Three reasons are given to explain why ____________________.

4. Men’s traditional working fields have declined because of ____________________.

5. According to a survey in the UK, most stay-at-home fathers feel _______________ to stay at home.

多项选择题