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下述哪几种酶的缺陷可导致同型胱氨酸尿症：

A.甲基四氢叶酸-同型半胱氨酸甲基转移酶
B．三磷酸腺苷双磷酸酶
C．胱硫醚合成酶
D．5，10-N一甲烯四氢叶酸还原酶
E．葡萄糖-6-磷酸酶

【参考答案】

A,B,C,D

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听力原文：W: Good morning.M: Good morning. What can I do for you?W: I'd like a ticket to Pittsburgh, please.M: Round trip?W: No. One way.M: Okay. That'll be twenty-two dollars.W: Twenty two? last time I took this bus it was only twenty.M: I know. The rates went up this month.W: Just like everything else.M: Yeah.Where does the dialogue take place?A．At the ticket office.B．In Pittsburgh.C．At the airport.

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下列哪几种酶的基因突变可导致酪氨酸血症?

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