问题 选择题

下列说法正确的是(  )

A.电热水器和电铃的主要部件都是电磁铁

B.换气扇和洗衣机的主要部件都是电动机

C.磁卡和VCD播放用的光碟都是应用了磁性材料

D.直流电动机中的换向器的作用是:线圈平面刚转到与磁感线平行的位置时就自动改变线圈中的电流方向

答案

A、电热水器的主要部件是电热丝,而电铃的主要部件是电磁铁,故该选项错误;

B、换气扇和洗衣机的主要部件都是电动机,故该选项正确;

C、磁卡是利用磁性材料,而VCD播放用的光盘没有用到磁性材料,故该选项错误;

D、直流电动机中的换向器的作用是:线圈平面刚转到与磁感线垂直的位置时就自动改变线圈中的电流方向,故该选项错误.

故选B.

阅读理解

The cost of medical care in the United States is very high. The time and money that doctors spend on their medical education is probably one reason for this problem.

A visit to a doctor’s office costs from 15 to 50 dollars. It’s so expensive. Many people in the United States think that doctors are overpaid. However, most doctors disagree. They say that they were asked to study medicine for a long time. Tuition for many years of medical education costs a lot of money. Doctors say that it is necessary for most medical students to borrow money from the bank to pay their tuition. Because their money must be repaid to the bank, young doctors need to receive a lot of money for their work. So they charge(收费)people high prices for medical care.

Therefore the cost of medical care in America is high. Because high tuition is one cause of high costs, one way to lower costs would be to have medical school that are free or have low tuition.

小题1:The underlined word "tuition" in the passage means “______”

A.eating at school

B.studying the courses

C.money used for education

D.living at school小题2:The main idea of the passage is that______.

A.a visit to a doctor’s office may cost much in the USA

B.the cost of medical care is the only reason for the high costs in the USA

C.medical care in the USA costs a lot of money because doctors want to be rich

D.the high cost of tuition in medical schools is one reason for the high cost of medical care in the USA小题3: The cost of medical care in the USA is very high. What does the writer think about it?

A.He agrees that doctors are overpaid.

B.He thinks it is a big problem and suggests (建议) solving (解决) it.

C.He doesn’t think the medical students should borrow money from banks.

D.He doesn’t think it necessary for the medical students to study for a long time.

单项选择题