问题 填空题

小青站在竖直放置的平面镜前1m处,她在镜中的像到镜面的距离是      m。

答案

1

题目分析:平面镜成像特点:像与物大小相同,物体到平面镜的距离和像到平面镜距离相等,物点和像点的连线与镜面垂直。平面镜成像特点可知,物体到平面镜的距离和像到平面镜距离相等,晶晶距平面镜1m,晶晶的像到镜面的距离是1m。

点评:此题要求学生对平面镜成像特点的理解和掌握,牢记平面镜成像特点是解答此题的关键。

单项选择题
单项选择题

Analysts have their go at humor, and I have read some of this interpretative literature, (1) without being greatly instructed. Humor can be (2) , (3) a frog can, but the thing dies in the process and the innards are (4) to any but the pure scientific mind.

One of the things (5) said about humorists is that they are really very sad ’people clowns with a breaking heart. There is some truth in it, but it is badly (6) . It would be more (7) , I think, to say that there is a deep vein of melancholy running through everyone’s life and that the humorist, perhaps more (8) of it than some others, compensates for it actively and (9) Humorists fatten on troubles. They have always made trouble (10) They struggle along with a good will and endure pain (11) , knowing how well it will (12) them in the sweet by and by. You find them wrestling with foreign languages, fighting folding ironing hoards and’ swollen drainpipes, suffering the terrible (13) of tight boots. They pour out their sorrows profitably, in a (14) of what is not quite fiction nor quite fact either. Beneath the sparking surface of these dilemmas flows the p (15) of human woe.

Practically everyone is a manic depressive of sorts, with his up moments and his down moments, and you certainly don’t have to be a humorist to (16) the sadness of situation and mood. But there is often a rather fine line between laughing and crying, and if a humorous piece of writing brings a person to the point (17) his emotional responses are untrustworthy and seem likely to break over into the opposite realm, it is (18) humor, like poetry, has an extra content, it plays (19) to the big hot fire which is Truth, and sometimes the reader feels the (20) .

5()

A.regularly

B.commonly

C.roughly

D.uniquely