正确答案: D

输电导线

题目：当温度降到一定程度时，某些物质的电阻会变为零，这种物质叫超导体。下列物体可以用超导体来制作的是

解析：D

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举一反三的答案和解析：

[单选题]19．

school

解析：19．C【解析】由全文第一句知她在学校工作。

[单选题]The Browns are ( 11) Smiths neighbors． Mr Brown's name is John． But when his neighbors talk about him，they ( 12 ) him "Mr Going-to-do ． Do you know why? Mr Brown always says he is going to do something，but he ( 13) does it．Every Saturday， Mr Brown ( 14 ) to the Smiths back door and talks to Mr Smith． He always says he ( 15 ) do something．"I，m going to clean my house today，"he says，( 16 ) "I'm going to wash my car tomor-row，"or"These trees in front of my house'are ( 17) big，l m going to cut them down next week．"Mr Smith usually says，"( 18) ，John?"He knows his neighbor is not going to clean his house，or wash his car，or cut down any trees． Then he says，"Well，excuse me，John． I-m going to do some work in the house． "And he ( 19) ．Mr and Mrs Smith often say to their only child Dick，"Are you going to do something?Then do it． Don-t be ( 20) 'Mr Going-to-do'．

the

[单选题]—Don't try to anything from me,Mary.—I know nothing about it,mum! I was sleeping at that time!

hide

[单选题]实验过程中要注意安全，下列实验操作中安全的是

点燃一氧化碳前先检验其纯度

[单选题]29． The writer thinks that people in large cities should __________ ．

make their used water clean again

解析：29.C【解析】由第四、五两段的描述可知，作者认为大城市的水应该被净化后重新利用。

[单选题]AThe aim(目的) of students who come to school is ro srudy． But if we haven't a right way to study we will waste the time or the money． The following are ways for studying．

to pay close attention to ways for studying

解析：Ⅲ．21．B【解析】此段主要讲学习方法，故选B．

[单选题]阅读《唐雎不辱使命》一文的节选文字，回答9-11题。秦王谓唐雎曰：“寡人以五百里之地易安陵，安陵君不听寡人，何也？且秦灭韩亡魏，而君以五十里之地存者，以君为长者，故不错意也。今吾以十倍之地，请广于君，而君逆寡人者，轻寡人与？”唐雎对曰：“否，非若是也。安陵君受地于先王而守之，虽千里不敢易也，岂直五百里哉？”

秦王色挠，长跪而谢之曰 谢：感谢

[单选题]Inthepassage,allthepsychiatrists_________.

studydreamanddreamingandhavetheirownideas