问题 问答题 简答题

昆虫翅连锁的几种类型的特点。

答案

参考答案:

翅连锁的几种类型:

(1)翅钩:后翅的前缘有一排小钩,钩在前翅后缘的折褶中,如蜂类和蚜虫。

(2)翅短褶:后翅的前缘有一段短而上卷的褶,钩在前翅后缘的折褶中,如蝉。

(3)翅轭:前翅轭区具一指状突,插入后翅前缘下方,用轭区与翅轭夹住后翅,如蝙蝠蛾、小翅蛾等。

(4)翅缰型:多数蛾类象一个夹子把两翅连接在一起,有一个翅缰沟,翅缰沟是位于前翅下面翅脉上的成列成的钩,在后翅前缘基部有一为很硬鬃,称翅缰,飞行时插在前翅的翅缰钩中。

(5)翅抱型:后翅肩角扩大生有肩脉,突伸于前翅后缘之下,使前后翅连接,如蝶类和枯叶蛾类。

阅读理解

阅读理解。

       Scientists have learned a lot about the kinds of food people need.  They say there are some kinds

of food that people should eat every day. They are (1) green and yellow vegctables of all kinds; (2) citrus

fruit and tomatoes; (3) potatoes ancJ other fruits and vegetables; (4) meat of all kinds, fish and eggs;  (5)

milk and foods made from milk;(6)  bread or cereal (谷类),  rice is also in this kind of food;  (7)  butter

or something like butter.

     People in different countries and different places of the world eat different kinds of things.  Food are

cooked and eaten in many different kinds of ways.  People in different countries eat at different times

of the day.  In some places people eat once or twice a day; in other countries people eat three or four

times a day.  Scientists say that none of the differences is really important.  It doesn't matter whether

foods are eaten raw (生的) or cooked,  canned (罐装的)  or frozen (冷冻的).  It doesn't matter if

a person eats dinner at four o'clock in the afternoon or at eleven o'clock at night.  The important thing

is what you eat every day.

      There are two problems,  then,  in feeding the large number of people on earth.  The first is to find

some way to feed the world's population so that no one is hungry. The second is to make sure that

people everywhcre have the right kinds of food to make them grow to be strong and healthy.

1. According to the scientists, which of the following groups of food is the healthiest for your lunch?

A. Chicken, apples, cereal, cabbages

B. Potatoes, carrots, rice, bread

C. Oranges, bananas, fish, tomatoes

D. Beef, pork, fish, milk

2.  It is important for people to cat________

A. three times a day

B.  dinner at twelve o'clock

C.  cooked food all the time

D.  something from each of the seven kinds of food every day

3.  People in different countries and different places of the world________.

A.  have the right kinds of food to eat

B.  cook their food in the same way

C.  have their meals at the same time

D.  eat food in different ways

4.  Which of the following is not true?

A.  People in some places don't have cnough to cat.

B.  There are too many people in the world.

C.  One of the problems is that no one is hungry.

D. The scientists are trying to make peoplc grow to be strong and hcaltliy.

5. If there is Paragraph (段落) 4, what do you think is going to to talk  about?

A.  When people eat their lunch.

B.  What to do with the two problems.

C.  How to cook food in clifferent ways.

D.  Why people eat different kinds of food.

单项选择题