下列关于电磁场的说法正确的是A.电势降低的方向就是场强的方向B.电场线实际不存在，磁感线实际存在C.磁通密度越大的地方，

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下列关于电磁场的说法正确的是
A.电势降低的方向就是场强的方向
B.电场线实际不存在，磁感线实际存在
C.磁通密度越大的地方，磁感应强度越大
D.法拉第发现了电流的磁效应现象

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Reasons for students’ exam stress
The expectation of their teachers and family	They don’ t want to 【1】 their teachers and family.
Fear of failure	They are worried about the 【2】 of the exam and their grades after the exam.
A foreboding feeling	They feel they haven’t 【3】 for the exam.
Not having 【4】	They don’ t have a good night’ s sleep before the exam.
Conclusion	Students can 【5】 to avoid exam stress after they know the reason for it.

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In recent history, there have been some amazing inventions which have changed our lives. The plane has made international travel faster and easier. The Internet has brought people closer.
And you must know the names of some famous inventors like Henry Ford and Steve Jobs. But there are many everyday objects which you probably don’t notice and you don’t know who invented them. Take for example Nils Bohlin, who invented the modern-day car seat belt (安全带).
Before 1959, only two-point seat belts were available, and the only people who often wore them were race car drivers. The two-point seat belt couldn’t protect passengers from internal injuries (内伤) during serious car accidents.
In 1958, Bohlin joined Volvo Car Corporation as a safety engineer. He came up with the three-point seat belt to keep passengers from flying out of their cars during collisions. The three-point seat belt used one strap (带子) across the chest (胸部) and another across the legs and then the two joined at the same place. Amazingly, this was a very simple idea which no one tried before.
The three-point seat belt was introduced on Volvo cars in 1959. For more people’s safety, Volvo made the new seat belt design (设计) available to other car makers for free. Since then, engineers have worked to improve the three-point seat belt, but the basic design remains Bohlin’s.
At the time of Bohlin’s death in September 2002, Volvo said that the seat belt had saved more than one million lives since it was introduced.
【1】The writer develops his ideas in Paragraph 1 by ________.
A.telling a joke B.giving some examples
C.asking some fun questions D.describing a personal experience
【2】What can we learn about the two-point seat belt
A.It was sold worldwide. B.It was not easy to wear.
C.It saved over one million lives. D.It was popular with race car drivers only.
【3】The underlined word “collisions” in Paragraph 3 means ________ in Chinese in this passage.
A.碰撞 B.清洗 C.制造 D.修理
【4】Bohlin invented the three-point seat belt ________.
A.in the early 1950s B.to get a job at Volvo
C.while working at Volvo D.after having a car accident
【5】The best title of this passage is ________.
A.Car safety B.A great car company
C.A life-saving invention D.Different kinds of seat belts

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下列关于电磁场的说法正确的是A.电势降低的方向就是场强的方向B.电场线实际不存在，磁感线实际存在C.磁通密度越大的地方，

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