问题 单项选择题

鸡油菌这种野生蘑菇生长在宿主树下,如在道氏杉树的底部生长。道氏杉树为它提 供生长所需的糖分。鸡油菌在地下用来汲取糖分的纤维部分为它的宿主提供养料和水。由于它们之间这种互利关系,过量采摘道氏杉树根部的鸡油菌会对道氏杉树的生长不利。以下哪项如果为真,将对题干的论述构成质疑

A.最近的几年中,野生蘑菇的产量有所上升。

B.鸡油菌不只在道氏杉树底部生长,也在其他树木的底部生长。

C.很多在森林中生长的野生蘑菇在其他地方无法生长。

D.对某些野生蘑菇的采摘会促进其他有利于道氏杉树的蘑菇的生长。

答案

参考答案:D

解析:如果D项的断定为真,则说明虽然过量采摘鸡油菌会直接割断和道氏杉树的互利关系,但有可能促进其他有利于道氏杉树的蘑菇的生长,而最终仍间接地对道氏杉树有利。这就构成了对题干的质疑。其余各项均不能构成质疑。

阅读理解

阅读理解。

     Every day we go to school and listen to the teacher, and the teacher will ask us some questions. Sometimes,

the classmates will ask your opinions of the work of the class. When you are telling others in the class what

you have found out about these topics, remember that they must be able to hear what you are saying. You are

not taking part in a family conversation or having a chat with friends-you are in a slightly (稍微的) unnatural

situation where a large group of people will remain silent, waiting to hear what you have to say. You must speak

so that they can hear you-loudly enough and clearly enough but without trying to shout or appearing to force

yourself.

     Remember, too, that it is the same if you are called to an interview whether it is with a professor of your

school or a govemment official who might meet you. The person you are seeing will try to put you at your ease

but the situation is somewhat different from that of an ordinary conversation. You must take special care that

you can be heard.

1. When you speak to the class, you should speak ____.

A. as slowly as possible

B. in a low voice

C. loudly

D. forcefully

2. Usually, when you speak to the class, the class is ____.

A. noisy

B. quiet

C. having a rest

D. serious

3. The situation in the class is ____ that in your house.

A. not very different from

B. sometimes the same as

C. sometimes not. the same as

D. not the same as

4. If you are having a conversation with an official, the most important thing for you is ____.

A. to show your ability

B. to be very gentle

C. to make sure that you can be heard

D. to put the official at ease

5. The main idea of this passage is ____.

A. that we should talk in different ways in different situations

B. that we must speak loudly

C. that we must keep silent at any time

D. that we must talk with the class

问答题 简答题