49. You can choose any activity to lose your weight except ______.

A. running          B. walking           C. swimming      D. cycling

B

When you want to go shopping, decide how much money you can spend on new clothes, think about the kind of clothes you really need. Then look for those clothes on sale. There are labels (标签) inside all new clothes. The labels tell you how to take care of your clothes. The label for a shirt may tell you to wash it in warm water. A sweater label may tell you to wash it in cold water. The label on a coat may say “dry-clean only”. Washing may ruin (毁掉) this coat. If you do as the directions say on the labels, you can keep your clothes looking their best.

Many clothes today must be dry-cleaned. Dry-cleaning is expensive. When buying new clothes, check to see if they will need to be dry-cleaned. You will save money if you buy clothes that can be washed. You will save money if you buy clothes that are well-made. Well-made clothes last longer. They look good even after they have been washed many times. Clothes that cost more money are not always better-made. They don’t always fit better. Sometimes cheaper clothes fit better than more expensive clothes.

50. The labels inside the clothes tell you          .

A. how to save money                B. whether they fit you or not

C. how to keep them looking best       D. where to get them dry-cleaned

51. From the passage we know that cheaper clothes          .

A. must be dry-cleaned         B. can not be washed

C. are always worse-made       D. can sometimes fit better

52. The best title for the passage should be          .

A. Buying Cheaper Clothes

B. Being a Clever Clothes Shopper

C. Taking Enough Money When Shopping

D. Reading the Labels Inside New Clothes

C

The Peppered Moth, a kind of insect (昆虫), is found in England. It is light brown in colour and likes to settle (定居)on trees which are also light brown. This makes the moth difficult to be found 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 happened in industrial areas. The Peppered Moth began to change colour. It became darker as well. Though the change took several years. Some scientists soon noticed 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 (作记号) 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 (再捕获) as many marked moths as possible. The results were as follows:

Light moths Darker moths

Moths set free 201 601

Moths recaptured      34 (16%)      206 (34%)

Kettlewell’s research was done in the early 1950s. Soon Britain brought in new laws to reduce smoke and factory pollution.

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