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【单选题】
《高层民用建筑设计防火规范》规定，二类高层建筑的耐火等级（）A.
应为一级
B.
不应低于二级
C.
不应低于三级
D.
不应低于四级
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反馈参考答案：
举一反三
【单选题】“ __________ were you born?” “On May 12, 1985”. [ ]
A.
What
B.
Which
C.
When
D.
where
【单选题】—When were you born? ． —I was born ________the morning of May 7th，1995．
A.
in
B.
on
C.
at
D.
during
【单选题】—When were you born? —____________.
A.
On March nineth
B.
In May 5
C.
On February fifteenth
【单选题】一When were you born? 一I was born ____ the morning of May 7, 1995. [ ]
A.
in
B.
on
C.
at
D.
of
参考解析：
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