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【单选题】
手性分子是指在分子结构 中，当a、b、x、y为彼此互不相同的原子或原子团时，称此分子为手性分子，中心碳原子为手性碳原子。下列分子中指定的碳原子（用*标记）不属于手性碳原子的是 [ ]A.
苹果酸
B.
丙氨酸
C.
葡萄糖
D.
甘油醛
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举一反三
【单选题】Whenever I ask a question in class, I expect a ______ answer from my students.
A.
punctual
B.
prompt
C.
rapid
D.
fast
【简答题】From the time I was seven, I had a dream of becoming a member of the Students Union. I always 1__ my school leaders for taking responsibility for all of us. So I dreamed of being a leader. Years flew ...
【单选题】—I think we students should wear school uniforms. — _____ We look smarter in our own clothes. [ ]
A.
I agree
B.
I think so
C.
I don't think so
D.
That's right
【简答题】下列建筑物中哪个可不设室内消防给水?（ ）
【单选题】— Why are you so popular with your students? — As a teacher, I seldom give my students so difficult a problem ____ they cannot work out.
A.
as
B.
that
C.
if
D.
which
【单选题】设有高位消防水箱的消防给水系统，当设有增压设施时，其增压水泵的出水量，对消火栓给水系统不应大于( )；对自动喷水灭火系统不应大于( )。
A.
10L／s；10L／s
B.
10L／s；5L／s
C.
5L／s；5L／s
D.
5L／s；1I。／s
【简答题】From the time I was seven, I had a dream of becoming a member of the Students Union. I always 31 my school leaders for taking responsibility for all of us. So I dreamed of being a leader. Years flew b...
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