问题 选择题

法国和德国的科学家费尔和格林贝格尔由于发现了巨磁电阻(GMR)效应,荣获了2007年诺贝尔物理学奖,如图所示的是研究巨磁电阻特性的电路示意图,当闭合S1、S2后,使滑片P向左滑动的过程中,指示灯明显变亮,则下列说法正确的是

A.滑片P向左滑动过程中电磁铁的磁性减弱

B.滑片P向左滑动过程中电磁铁的磁性增强

C.磁场随巨磁电阻阻值的减小而增大

D.巨磁电阻的阻值随磁场的增强而明显增大

答案

答案:B

题目分析:滑片向左滑动,滑动变阻器接入电路的阻止减小,电路中电流增大,电磁铁的磁性增强,所以B对A错;灯变亮,说明巨磁电阻的阻值减小,则巨磁电阻的阻值随磁场增强而明显减小,所以C、D错。

阅读理解

English A

Because it’s never too late to start learning English Course structure and goals

A basic course that improves different English skills. Lessons focus on pronunciation of words and sounds, listening, practicing casual English, reading and combining all of these skills together.

We learn through introducing ourselves to friends and family, discussing everyday activities, food, restaurants, shopping and places.

This course is for People who have learned very little English in the past.

Duration(学时)

Class meets once a week over an 8-month period.

Moreover, students can take advantage of our extra lessons, for an additional hour per week.

At the end of the course the student will

● Understand sentences and phrases dealing with topics such as: personal and family information, shopping, geography, etc.

● Read short and simple sentences, find information in everyday texts, such as: advertising, menus, etc.

● Have short conversations.

● Communicate through simple everyday tasks.

● Describe their personal background, living conditions and other information about their surroundings.

● Write short and simple notes, messages and personal letters.

小题1:According to the passage, which of the following is TRUE?

A.You have to finish all the courses online.

B.You can get extra lessons for an hour a day.

C.The course includes different English skills.

D.Only children can join in this English course.小题2:The information of the passage is about         .

A.some ways to learn English well

B.a course for English beginners

C.the reasons for learning English

D.some advice from an English teacher小题3:After finishing this course, you can         .

A.know much about English countries

B.understand long and difficult English texts

C.talk about everything with foreigners freely

D.communicate with others in short conversations小题4:The passage is mostly likely to be found from a         .

A.novel

B.report

C.website

D.story

单项选择题