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    　　Your body is made up of little cells（细胞）.Each one of these is alive. The big difference between your body and a man-made machine is that every part of your body is alive. Each cell has a job to do and needs energy to do it. If you count correctly, you will find the total is around 60,000,000 cells.

    　　Nerve（神经）cells have long thread like shapes. Bone cells may have branching parts to link with other cells, while red blood cells are round and almost flat.

    　　The cells are alive, but they do not live nearly as long as you do. Each cell lives for a while--from a few weeks to a year or more--and then it dies and a new cell is made to do the same. Only one kind of cell is not made after birth, the brain cells. So a new born baby is the brainiest person in the world, he has a full set of brain cells in thinking.

    　　All our lives, we are storing more and more information in the brain. The fastest rate is at the time when we are young.

    (1) Which one of the following is right?

    [　　]

    A．Everything in the world is made up of little cells.

    B．Nothing has cells but people.

    C．The man-made machine's cells are dead.

    D．Your legs are made up of little ceils.

    (2) The amount of cells in a human body is ______.

    [　　]

    A．about sixty billion

    B．about sixty million

    C．less than sixty million

    D．more than sixty billion

    (3) The shapes of cells in the human body are ______.

    [　　]

    A．about the same

    B．almost round or flat

    C．changed at any time

    D．quite different

    (4) _______ after birth.

    [　　]

    A．Each kind of cell can be made

    B．Not all cells can be made

    C．The brain cells are changeless

    D．The new cells are made unlimitedly

    答案：D;B;D;B
    解析：

    (1)因为在第一段谈到人的身体是由细胞构成的，而腿是身体的一部分，因此可以推出也是由细胞构成的．

    (2)从第一段得知．

    (3)从第二段中可以推断出这一点．

    (4)因为在第三段谈到只有脑细胞是生来就有的，所以可以推断出这一点．


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    What is in the drug that makes you sick or dead? For example, cocaine is harmful, but what makes it harmful?

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