问题 选择题

下表是显微镜使用中的目的及对应操作,其中错误的是( )

 目的操作
A调换不同倍数的物镜转动转换器
B使物像更清晰转动细准焦螺旋
C调节物像大小转动遮光器
D将视野左上方的物像移到中央将装片向左上方移动

答案

C.

题目分析:显微镜使用的基本方法是取镜安放;对光,将反光镜的光线对准通光孔,同时目镜和物镜在一条线上,在镜下观察到雪白的亮点;放置玻片标本,先用低倍镜观察,缓慢调节粗准焦螺旋找到物像,再反方向调节细准焦螺旋,使观察到的物像更清晰;在显微镜下观察到的物像是倒像,左右下上下颠倒,如果在视野的左上方向的物像移到视野的中央,这样标本要向左上方移动;观察完毕后显微镜回放。因此,选项C.调节物像大小主要是通过目镜和物镜来调节,而不是转动遮光器,遮光器上有许多大小不同的光圈,调节光线的强弱,故选项C.说法错误,符合题意。

考点:本题考查的知识点是显微镜使用的方法。

完形填空

阅读下面短文,根据下面小题的具体要求,尽可能简要回答问题,并将答案转写到答题卡上。

Playing is serious business for children. In fact, it's what they do best! Ask them why they do it, and kids will probably say,"Because it's fun!" But it's much more than that. It's also good for them.

Studies show that from birth babies begin learning through play. They use their five senses to get know their new world. Touching allows them to discover how different things feel. Brightly colored toys and clothing help develop a baby's sense of sight.

When small children choose which toy to play with, they begin developing their abilities in making decisions.

Children love toys that allow them to use their imagination. Sometimes an empty box is more fun than a high-tech toy. That's because a box can become anything a child imagines it to be.

Crayons, paints and Play-Doh(彩色塑泥) are also good because they allow children to create. Traditional building blocks teach important pre-math skills like problem-solving.

Playing doesn't become any less important once children start school. Many valuable lessons about life are learned on the school playground. Kids learn how to share, take turns and play by the rules.

小题1:What can children do best in their childhood? (回答词数不超过1个)

                                                                                

小题2:What do colored toys and clothing help develop?(回答词数不超过5个)

                                                                                

小题3:Children like toys to develop their imagination. Do you think so?(回答词数不超过5个)

                                                                                

判断题