题目内容：

Drugs（药物）come in different ways. However, can you imagine that drugs come in chicken eggs? A team of scientists from England say that it can come true. They have developed special chickens that lay eggs with drugs inside. These special drugs can help with some kinds of illnesses. Until now, they have made two kinds of drugs. One drug can deal with skin problems and the other can deal with a nerve disease(神经性疾病).

Certain drugs are produced by the special chickens inside their egg whites. These drugs are made of proteins which can be found in animals’ skin, hair, milk and meat. The scientists also use DNA technology to make sure that the drugs are only inside the egg whites. In this way, the chickens can stay healthy.

Besides egg whites, drugs made of proteins come in milk of cows and sheep. Compared with cows and sheep, the special chickens have ascendancy over them. First, they are cheaper to raise. Second, they need less room and grow faster.

These special chickens can pass on their drug-producing ability. So far, five generations of the special chickens have appeared. But scientists may need more time to make the drugs perfect. It’s said that scientists will realize their dream in five to ten years.

1.What is the passage mainly about?

A. It’s mainly about a serious illness.

B. It’s mainly about a natural ability of chickens.

C. It’s mainly about the special drugs.

D. It’s mainly about the DNA technology.

2.According to the passage, the special chickens _________.

A. don’t need much room and it grows very slowly

B. were developed by scientists from France

C. produce certain drugs outside the eggs

D. can pass on this drug-producing ability to their children.

3.The underlined word “ascendancy” in the passage means “________” .

A. problems B. advantages C. disadvantages D. situations