Ø"x(F(x)®G(x))Û $xØ(F(x)®G(x))。

A. 对
B. 错

"x(A(x) ∨B(x)) Û "xA(x) ∨"xB(x)

A. 对
B. 错

Sorry sir. This weekend happens to be our long national holiday and we are all booked up.

A. The lady wants a room but there isn’t one available.
B. Weekends are bad days to book a room.
C. The man wants to spend his long holiday in this hotel.
D. The man was not successful in making a room reservation.

A : What kind of room would you like , sir ?B :_________________________.

A. Yes, I would
B. A double room, please
C. Fine
D. No, I would not

A :_________________________?B : Yes , I’d like to book a room for my friend , Cray Smith.

A. How are you
B. That is OK
Can I help you
D. How do you do

-Hello, I’m calling to confirm my room reservation. My name is Jane Smith.-（）

A. Where are you calling from?
B. Of course, madam.
C. Sorry, there is no room available, madam.
D. What’s your room number, madam?

关于腐败作用的错误叙述是

A. 主要在结肠进行
B. 是细菌对蛋白质或蛋白质消化产物的作用
C. 主要是氨基酸脱羧和分解作用
D. 腐败作用产生的多是有害物质
E. 腐败作用不产生氨

下列哪些化合物不是尿素合成的中间产物

A. 瓜氨酸
B. 甘氨酸
C. 鸟氨酸
D. 精氨酸
E. 精氨酸代琥珀酸

下列哪种有机物可接受N5-甲基四氢叶酸转来的甲基

A. 甲硫氨酸
B. 同型半胱氨酸
C. SAM
D. 腺苷
E. ATP

参与转氨脱氨作用的酶是氨基转移酶和 。