B
You may know the saying: An apple a day keeps the doctor away. A recent study by the Chinese University of Hong Kong has discovered another saying: An apple a day keeps old age away.
The study involved fruit flies, as they share many genes (基因) with humans. Researchers gave food to two groups of fruit flies. Both groups got the same fruit, with one exception: The second group also got apples, while the first did not.
The results showed that flies that ate apples lived an average of 55 days longer than the flies that didn't eat apples. The study also found that apple - eating flies were more able to walk, climb and move about as they became old, *Journal of Agricultural and Food Chemistry* reports.
The researchers believe that the
antioxidants found in apples are good for health.
In another experiment, researchers studied the diets of thousands of women. They found that those women who often ate apples were 20 per cent less likely to have a heart attack.
Scientists have recently discovered the apple's genetic code (遗传密码). This allows scientists to make new kinds of fruits that are healthier. Researchers are already using this information to grow apples with added antioxidants. Antioxidants help to keep eyes and joints (关节) healthy and protect against heart attacks and cancer.
Apples that help people lose weight may be in supermarkets in just four or five years. They are said to be "extra healthy" apples that can stop people from overeating.
(
B
)4. Fruit flies were used in the research because
.
A. they love to eat apples
B. they share similar genes with humans
C. they are easy to catch
D. they can live longer
(
A
)5. The underlined word "antioxidants" in Paragraph 4 probably means "
".
A. things that help keep you healthy
B. a kind of apple
C. something bad for your health
D. a new kind of food
(
A
)6. By studying the diets of thousands of women, the researchers
.
A. proved apples are good for people's health
B. found they are healthier than men
C. helped them lose weight successfully
D. discovered the genetic code of the apple
(
C
)7. From the passage, we can infer (推断) that
.
A. women like to eat apples more often than men
B. people who eat apples will not suffer from heart disease
C. scientists are studying a new type of apple
D. apples' genetic code is similar to other fruits
