Question

阅读理解(Reading comprehension)：

　　The Peppered Moth(蛾), a kind of insect, is found in England. It is light brown in colour and likes to settle on trees which are also light brown. This makes the moth difficult to be seen and birds are less likely to notice and eat it.

　　But with the development of industry, smoke from factories began to reach the trees where the moth settled. It made the trees blacker. Then something very strange took place：in industrial areas, the Peppered Moth began to change colour. It became darker as well. Though the change took several years, some scientists soon notice that newly born moths were a little darker than usual.

　　A scientist called Kettlewell decided to make a careful study of this phenomenon(现象). He marked some of the light moths and some of the darker ones, and set them free in the woods near Birmingham, an industrial city. Later, recaptured(重新捕获) as many the marked moths as possible. (The results were given in the chart.)

　　Kettlewell's research was done in the early 1950s. Soon afterwards Britain introduced new laws to reduce smoke factory pollution.

Can you imagine what would happen to the Peppered Moth as the air became cleaner again?

1．The trees where the Peppered Moth settled changed their colours because ________.

[　　]

A．the Peppered Moth changed its colour

B．the Peppered Moth can't be easily found on them

C．industry in England developed quickly

D．the smoke from factories polluted them

2．The Peppered Moth began to change its colour in industrial areas because ________.

[　　]

A．it itself liked to

B．it could be like the colour of its living place

C．it had to keep the laws of nature

D．it was usually dark brown

3．From the results of Kettlewell's research, we can see that ________.

[　　]

A．many more of the light moths were killed or eaten

B．more than one-fifth of the light moths escaped being killed

C．three times as many dark moths were kept safe as light ones

D．more dark moths were killed in industrial areas

4．Kettlewell's work gives us a good example of ________.

[　　]

A．“Life-long Struggle”

B．“Rule of Colour”

C．“Choice of Nature”

D．“Self-Protection”

5．As the air became cleaner, ________.

[　　]

A．the number of the light moths increased

B．the total number of the light moths remained unchanged

C．there were more of the darker moths and fewer of the light ones

D．the darker moths changed into the light ones suddenly

Answer 1

答案：D;C;A;C;A