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问题 选择题

青藏高原海拔3500米以上生长的冬虫夏草属于哪种生物（　　）

A．植物

B．昆虫

C．真菌

D．细菌

答案

冬虫夏草是一种真菌，是一种特殊的虫和真菌共生的生物体，是冬虫夏草真菌的菌丝体通过各种方式感染蝙蝠蛾（鳞翅目蝙蝠蛾科蝙蝠蛾属昆虫）的幼虫，以其体内的有机物质作为营养能量来源，经过不断生长发育和分化后，最终菌丝体扭结并形成子座伸出虫体的外壳，从而形成的一种特殊的虫菌共生的生物体．

故选：C

单项选择题

文稿若是打印件，单位符号（指单位的国际符号）毫无例外的使用（）

A.大写字母

B.小写字母

C.正体字母

D.斜体字母
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单项选择题

A punctual person is in the habit of doing a thing at the proper time and is never late in keeping an appointment.
The unpunctual man, on one hand, never does what he has to do at the proper time. He is always in a hurry and in the end loses both time and his good name. A lost thing may be found again, but lost time can never be regained. Time is more valuable than material things. In fact, time is life itself. The unpunctual man is for ever wasting and mismanaging his most valuable asset as well as other’s. The unpunctual person is always complaining that he finds no time to answer letters, or return calls or keep appointments promptly. But the man who really has a great deal to do is very careful of his time and seldom complains of want of it. He knows that he can not get through his huge amount of work unless he faithfully keeps every piece of work when it has to be attended to.
Failure to be punctual in keeping one’s appointments is the sign of disrespect towards others. If a person is invited to dinner and arrives later than the appointed time, he keeps all the other guests waiting for him. Usually this will be regarded as a great disrespect to the host and all other guests present.
Unpunctuality, moreover, is very harmful when it comes to do one’s duty, whether public or private. Imagine how it would be if those who are put in charge of important tasks failed to be at their proper place at the appointed time. A man who is known to be habitually unpunctual is never trusted by his friends or fellow men.

According to the passage, the main reason that a person is always unpunctual is that ______.

A. he has more work to do than other people
B. he is always in a hurry when he works
C. he doesn’t care much about time
D. he always mismanages and wastes his time
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