题目

This is a photo _______ my family. A . for B . to C . of D . on 答案：CThe Peppered Moth, a kind of insect(昆虫), is found in England. It is light brown in colour and likes to settle(栖息) 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(工业) , 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 with the name 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 Bermingham, an industrial city. Later, he recaptured(重新捕获) as many as the marked moths as possible. The results were as follows. light mothsdarker mothsMoths set free201601moths recaptured34(16%)206(34%)Kettlewell's research (研究) was done in the early 1950s. Soon afterwards Britain introduced new laws to reduce smoke and factory pollution.Can you imagine what would happen to the Peppered Moth as the air became cleaner again?1.The Peppered Moth began to change its colour in industrial areas because ______.A.it itself liked toB.it could be like the colour of its living-placeC.it had to keep the balance of natureD.it was usually dark brown2.From the results of Kettlewell's research, we can see that ______.A.many more of the light moths were killed or eatenB.more than one-fifth of the light moths was not killedC.three times as many dark moths were kept safe as light onesD.more dark moths were killed in industrial areas3.As the air became cleaner, ______.A.the number of the light moths became largerB.the total number of the light moths remained unchangedC.there were more of the darker moths and fewer of the light onesD.the darker moths changed into the light ones suddenly