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    Long ago, scientists studied the viruses that cause diseases. They found out that after a person has had a disease, he seldom gets it again. He is said to be immune to that disease. This means that his body has developed a way of fighting the germs. However, people do not seem to become immune from colds. This fact puzzled the scientists for some time.

    The scientists already knew that the cold is caused by a very tiny kind of germ called a virus. Therefore, they tried to capture cold virus. They wanted to study it in the laboratory. They knew that if they succeeded, they would be able to find a cure for colds.

    Finally, a scientist did manage to grow cold germs in a laboratory. He discovered that there are a hundred kinds of cold viruses. Each of them can cause people to have colds. If a person becomes immune from some, there are still many others that can infect him.

    Fortunately, a person develops more immunities as he grows older. That is why adults are less likely to catch cold than children.

    Câu hỏi:

    Why don’t people become immune from colds?

    • A. Because people are not healthy.
    • B. Because the virus is strong.
    • C. Because the germs are too small.
    • D. Because there are many kinds of cold viruses.

    Lời giải tham khảo:

    Đáp án đúng: D

    ADSENSE

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