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下列哪几种酶的基因突变可导致酪氨酸血症?

A.二氢生物喋啶还原酶
B．酪氨酸转氨酶
C．胱硫醚合成酶
D．对羟苯基丙酮酸双氧化酶
E．延胡索酰乙酰乙酸水解酶

【参考答案】

B,D,E

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听力原文： Nearly at nine o'clock in the evening, suddenly the telephone was ringing. Dr. Johnson went to answer it. He was asked to go and operate on a very sick boy. The boy was in hospital He had shot himself while playing with a gun. His life was in danger. After he heard this, Dr. Johnson decided to go at once. It was snowing. Dr. Johnson was driving carefully. He thought he could get to the hospital before twelve o'clock though the hospital was sixty miles away from his city. A few minutes later, Dr. Johnson's car had to stop for a red light at a pressing. Suddenly a man in the old black coat with a gun got in the car. He ordered the doctor to get out of the car, and then he drove on down the road. Dr. Johnson had to go by train, but got to the hospital late. The boy's father, with his head in his hands, was the man in the old black coat.Why was Dr. Johnson driving carefully?A．He was a new driver.B．The weather was very bad.C．It’s too dark.

A.
B.
Why
C.He
D.
B．The
E.
C．It’s
F.

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值班员应站在易于缭望、能确认前方进路又能使司机看见信号的位置上显示信号.()参考答案：错误

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