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【单选题】
生物化学迈入分子生化阶段的标志性事件是（）。A.
三羧酸循环的阐明
B.
鸟氨酸循环的发现
C.
核酸DNA双螺旋结构的发现
D.
中心法则的提出
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举一反三
【单选题】—What's in the box? —Oh, my new _____. [ ]
A.
sport shoe
B.
sport shoes
C.
sports shoe
D.
sports shoes
【简答题】选 1 数据选择器,它有 ( ) 位地址码,有 ( ) 个输出端。
【多选题】以下说法正确的是()
A.
SM1、SM2为串行口的工作方式选择位
B.
REN=1，表示允许串行接收
C.
串行口有两个缓冲寄存器(SBUF)，它们的地址是99H
D.
串行口工作方式1的数据帧格式为：1个起始位+9个数据位+1个停止位
【单选题】听力原文：M: I'm looking for some sports shoes. Can you give me some advice? W: That's what I'm here for, Sir. Could you tell me what size you take? M: Of course, 41. W: Ok, we have plenty of choices for y...
A.
Few things.
B.
Not many things.
C.
Plenty of choices.
D.
Nothing in his size.
【单选题】听力原文：M: I'm looking for some sports shoes. Can you give me some advice? W: That's what I'm here for, Sir. Could you tell me what size you take? M: Of course, 41. W: Ok, we have plenty of choice for yo...
A.
few things.
B.
not many things.
C.
plenty of choice.
D.
nothing in his size.
【单选题】— Excuse me. Do you have shoes for sports? — Yes, we have lots of shoes _______ very good prices.
A.
at
B.
with
C.
for
D.
in
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