问题 填空题

晴朗的月夜,在南滨路岸边赏月,已知赏月处水域水深4m,月球到水面距离是3.84×105km,赏月的人低头看到河中月亮的像与江面的距离为______km,看到的江中的月亮是天上的月亮的______(填“实”或“虚”)像.

答案

水面相当于平面镜,因为月球距水面为3.84×105km,由根据平面镜成像特点可知,水中月亮距水面距离等于月球距地球的距离,即s=3.84×105km;

像是由光的反射形成的,它是由反射光线的延长线的交点形成的,所以成的是虚像.

故答案为:3.8×105;虚.

多项选择题
单项选择题

At some time in your life you may have a p desire to do something strange or terrible. However, chances are that you don’t act on your impulse, but let it pass instead. You know that to commit the action is wrong in some way and that other people will not accept your behavior.
Perhaps the most interesting thing about the phenomenon of the behavior is how it can change over the years within the same society, how certain behavior and attitudes once considered taboo can become perfectly acceptable and natural at another point in time. Topics such as death, for example, were once considered so upsetting and unpleasant that it was a taboo to even tall about them. Now with the publication of important books such as "On Death and Dying" and "Learning to Say Goodbye", people have become more aware of the importance of expressing feelings about death and, as a result, are more willing to talk about this taboo subject.
One of the newest taboos in American society is the topic of fat. Unlike many other taboos, fat is a topic that Americans tall about constantly. It’s not taboo to tall about fat; it’s taboo to be fat. The "thin" look is thin, not fat.
In the work world, most companies prefer youthful-looking, trim executives to sell their image as well as their products to the public. The thin look is associated with youth, vigor and success. The fat person, on the other hand, is thought of as lazy and lacking in energy, self- respect. After all, people think, how can people who care about themselves, and therefore the way they look, permit themselves to become fat In an image-conscious society like the U.S., thin is "in", fat is "out".

Based on the ideas presented in the passage we can conclude that, in American society, "being fat" ______.

A. has long been a taboo
B. will always remain a taboo
C. may no longer be a taboo someday
D. is not considered a taboo by most people