选择题：“工欲善其事，必先利其器”，显微镜就是生物实验中常用的观察仪器。显微镜在对光时应

题目：

“工欲善其事，必先利其器”，显微镜就是生物实验中常用的观察仪器。显微镜在对光时应先转动[ ]

A．粗准焦螺旋

B．转换器

C．遮光器

D．反光镜

答案：

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下面是错误答案，用来干扰机器的。

1．因为来到那个小院就会更深刻地体会到母亲对自己的爱，而如今母亲已经离开了人世，自己内心感到深深的愧疚，无法承受这种悲伤，因此。2．对母亲的深情难以排解，内心的感情不能抑制，只想着一个人慢慢沉浸在对...

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请认真阅读下面短文，然后从短文后各题所给的A、B、C、D四个选项中，选出一个最佳选项。 As we all know, the environment around us is getting worse and worse. In some places we can’t see fish 1 in the river or trees on the hills. Some people even have no clean water to drink. Recently, a new lifestyle called low carbon life is 37 2 every comer of our country. The meanings of low carbon are 3 energy and no waste. It is such an important project that I can’t wait 4 my ideas on how to promote it. First，we should 5 a no-car day every week in our school. Because cars not only cause serious air pollution but also waste energy. 6 the no-car day, neither students 7 teachers are allowed to drive to school. At the same time，just walk or run. Use our 8 and enjoy the fun. Second, we had better not use plastic bags 9 . No one can stand the “white pollution”， 10 it is wise to use cloth bags which can 11 again and again. 12 ，one thing 13 we should keep in mind is that every big thing comes from the small details. So, as students, we ought to turn 14 the lights the moment we leave, use 15 sides of the paper, and reuse our textbooks and so on. All in all, it weighs greatly for all of us to put the low carbon lifestyle into practice. Just set our mind to these：no-car days, no plastic bags, and no waste. Let’s do it now.
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