问题 选择题

在“模拟保护色形成过程”活动中,取红、绿、蓝、黄四种颜色小纸片各25张,放在一块绿布上,实验者先背对绿布,然后转身快速拿取.经过若干次后,最后剩下的小纸片数量最多的应是(  )

A.红色的

B.绿色的

C.蓝色的

D.黄色的

答案

本实验中,绿色的纸片与背景颜色蓝布一致,在模拟的取食过程中,与背景颜色不一致的红色、蓝色、黄色等纸片首先被取食,而与背景颜色一致的绿色的纸片不易被“捕食者”发现,这样,经过几代选择后,剩余个体的体色就与环境颜色一致了,即剩下的小纸片的颜色绝大部分是绿色.该实验说明,动物保护色的形成是环境对生物进行的长期自然选择的结果.
故选B.

阅读理解

There are over one million superstitions(迷信), and most people believe at least one or two of them.

Many people are superstitious about numbers. They think that there are lucky numbers and unlucky numbers.

The number 13 is often considered unlucky. In some parts of the world, buildings have no 13th floor and streets have no houses with the number 13. In Japan, "4" is considered unlucky because in Japanese the word "four" is pronounced the same as the word "death" .

Japanese never give gifts of four knives, four napkins, or four of anything.

What are the lucky numbers? Seven is a lucky number in many places, and "8" is considered a lucky number in Japan and China. In China, businesses often open on August 8, and many couples register to get married at eight past eight on August 8.

Superstitions about numbers are so widespread that some people--called numerologist--make a living by giving advice about numbers.

In 1937, when the Toyoda family of Japan wanted to form a car company, they asked a numerologist if "Toyoda" would be a good name for the company. The numerologist said it would not be. He explained that "Toyota" would be a better name for the company. The family took his advice. As a result, millions of people drive "Toyota" and not "Toyoda" .

There are many other kinds of superstitions. There are superstitions about eating, sleeping, sneezing and itching(抓痒). There are superstitions about animals and holidays and horseshoes.

There are even superstitions about superstitions. Those superstitions will tell people how to reverse bad luck.

When the Japanese bump heads, they immediately bump heads again. According to a Japanese superstition, the first-bump means their parents will die, but the second bump "erases" the first bump         

To reverse bad luck in general, people turn around three times, turn their pockets inside out, or put their hats on backwards.

In the United States, baseball players sometimes wear their caps backwards when their team is losing. It looks silly, but the baseball players do not mind if it helps them win the game.   

小题1:It can be inferred that superstitions about numbers are           .

A.popular neither in Japan nor in China

B.popular only in Japan and in China

C.popular both in Japan and in China

D.causing great troubles both in Japan and in China小题2:The underlined word " reverse " means           .

A.change to bad luck

B.cause to go in the opposite direction

C.change for the worse

D.exchange小题3:If a Japanese purposely bumps his head again after an accidental bump, we can be sure that     .  

A.he is mad

B.he is happy

C.he is superstitious

D.he is very sad小题4:The writer wrote this passage with the purpose of           .

A.persuading us to believe superstitions

B.showing us some facts of superstitions

C.showing us the magic power of number

D.showing us a numerologist

单项选择题 A1型题