有哪些措施对预防癌症的发生和早期治疗有利?

If the rose can be said to be a special flower, then the apple can be said to be a special fruit. It is very important in American culture. American stories speak of Johnny Appleseed, who went throughout America collecting apple seeds and planting apple trees. He had a great love for nature and went through fields and farms adding richness and beauty to the country.

One of the first sayings taught to school children is, "An apple a day keeps the doctor away." This short saying encourages children to eat fresh fruit to keep healthy. If someone always says good words to a person, people will call him an "apple polisher". This, however, is not a good name. If someone is very dear to us, we say that he or she is the "apple of our eye".

Most people believe that the fruit which Eve gave to Adam was an apple, even though the Bible(圣经) never says so. The apple, therefore, is a deep part of the language and stories of America.

An apple is also delicious. Apples can be cooked in many ways, used as a dessert (甜点) , and made into sweet juice.

In many parts of the country during the harvest season, a popular activity is to go into an apple garden to pick apples. Washington, D. C. and New York are both famous for their apples.

Finally, when it’s time to take a vacation to American cities, one can always visit New York, which is "the biggest apple" of all the American cities.

小题1:Why was Johnny Appleseed so famous?

A．He had a great love of nature.

B．He liked the American people.

C．He went throughout the country.

D．He collected apple seeds and planted apple trees.小题2:What does the underlined phrase "apple polisher" mean?

A．Something for cutting apples.

B．A person who likes to please others.

C．A person who is dealing with fruits.

D．A machine for cleaning apples quickly.小题3:Which of the following is TRUE with apples?

A．Apples are medicine.

B．Apples are the most important food.

C．New York is famous for its big apples.

D．The Bible says Adam was given an apple.小题4:The passage is mainly about______.

A．stories about the apple

B．apples in American culture

C．some famous sayings of the apple

D．big cities that is famous for apples

（）是一篇极美的小说，讲的是一个小和尚和一个叫英子的小姑娘清清爽爽、朦朦胧胧的爱情。

臀位分娩，当脐部娩出后，一般应在多长时间内结束分娩（）

A.8分钟内

B.8～10分钟

C.10～15分钟

D.15～20分钟

E.20～30分钟

精密仪器、电器着火时应用（）灭火。

A.1211灭火器

B.干粉灭火器

C.二氧化碳灭火器

①基因和染色体存在明显的平行关系

②抗维生素D佝偻病为常染色体遗传病

③鸡的性别决定方式和人类相反

④配子的多样性和受精的随机性，导致同一双亲后代呈现多样性

以上四项描述正确的是（）

A.②③④

B.①②③

C.①②④

D.①③④