问题 连线题

(6分)请将以下几项显微镜结构的作用填在左侧相应的横线上;

①细准焦螺旋                     

A.分为平面镜和凹面镜,反射光线

②粗准焦螺旋

B.接近观察物体的镜头

③遮光器

C.接近人眼睛的镜头

④反光镜

D.调节光线的强度⑤目镜                            E.转动时,镜筒升降范围较小 

⑥物镜                            F.转动时,镜筒升降范围较大

答案

① E     ② F     ③D      ④ A     ⑤ C     ⑥ B

题目分析:显微镜的各个结构和功能如下:粗准焦螺旋,升降镜筒的范围大;细准焦螺旋,升降镜筒的范围小;镜臂,支撑镜筒,上端连镜筒,下端固定在镜柱上;镜柱,支撑镜臂成三角形;目镜,在镜筒的上端观察时靠近眼睛;镜筒,固定在镜臂上端,镜筒上端安装目镜,下端安装物镜;转换器,在镜筒的下端,圆形可以安装物镜;物镜,安装在镜筒的下端,观察时靠近玻片标本;载物台,固定在镜臂的下端,是放置玻片标本的;通光孔,在载物台的中央,是光线通过的通道;遮光器,在载物台下紧靠载物台,上有大小不同的光圈;压片夹,两个在载物台上一端固定,用来固定玻片标本;反光镜,在镜臂的最下端,可以左右前后转动,是反射光线用的;镜座,在最下面,成U形是固定显微镜的。

阅读理解
The following is a recent survey among teenagers:
Radio
Most teenagers nowadays are not regular listeners to radio. They may occasionally tune in, but they do not try to listen to a program specifically. The main reason teenagers listen to the radio is for music, but now with online sites streaming music for free they do not bother, and users can choose the songs they want instead of listening to what the radio presenter/DJ chooses.
Television
Most teenagers watch television, but usually there are points in the year where they watch more than average. This is due to programs coming on in seasons, so they will watch a particular show at a certain time (as long as it lasts) but then they may watch no television for weeks.
Teenagers are also watching less television because of services such as BBC iPlayer, which allows them to watch shows when they want. Whilst watching TV, adverts come on quite regularly (18 minutes of every hour) and teenagers do not want to watch these, so they switch to another channel, or do something else whilst the adverts run.
Newspapers
No teenager that I know of regularly reads a newspaper, as most do not have the time and cannot be bothered to read pages and pages of text while they could watch the news summarized on the Internet or on TV.
Internet
Every teenager has some access to the Internet, be it at school or home. Home use is mainly used for fun (such as social networking) whilst school (or library) use is for work. Most teenagers are heavily active on a combination of social networking sites. Facebook is the most common, with nearly everyone with an Internet connection registered and visiting >4 times a week. Facebook is popular as one can interact with friends on a wide scale.
For searching the web, Google is the dominant figure, simply because it is well known and easy to use. Some teenagers make purchases on the Internet (on sites like eBay) but this is only used by a small percentage, as a credit card is required and most teenagers do not have credit cards. Many teenagers use YouTube to watch videos (usually anime which cannot be watched anywhere else) and some use it as a music player by having a video with the music they want to listen to playing in the background.
Mobile Phones
99pc of teenagers have a mobile phone and most are quite capable phones. Usually, teenagers only use their phones for texting, calling. Features such as video messaging or video calling are not used—because they are expensive.
Services such as instant messaging are used, but not by everyone. It usually depends whether the phone is Wi-Fi compatible, because otherwise it is very expensive to get Internet off the phone network. As most teenagers’ phones have Bluetooth support, and Bluetooth is free, they utilize this feature often.
Mobile email is not used as teenagers have no need; they do not need to be connected to their inbox all the time as they don’t receive important emails.
小题1:   The survey carried out recently is mainly concerned with ______.
A.how teenagers consume media
B.what electric devices teenagers favor
C.which new trend teenagers are following
D.how teenagers contact others and make their social net
小题2:   As is mentioned in the survey, the reason why teenagers watch less TV mainly lies in that ______.
A.teenagers do not watch regular programs
B.all the TV programs are on for only a few weeks
C.teenagers may turn to other devices to watch their favorite
D.the TV adverts coming on every channel are just the same
小题3:   Which of the following is TRUE according to the survey?
A.Radio presenter or DJ used to invite the listeners to choose the songs they want.
B.The main source for teenagers to get news is Internet as well as newspapers.
C.Google is the most common social networking sites due to its convenience.
D.Some features of modern mobile phones are not widely used by teenagers.
问答题 简答题