单项选择题

During the last vacation, I visited many areas of the United States______I had never seen before.
A．what
B．when
C．which
D．where

A.
A．what
B．when
C．which
D．where

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多项选择题

下列容器中，哪些属于反应容器（）。

A.硫化缸
B.蒸球
C.蒸发锅

单项选择题

He teaches a class for students______native language is not English.
A．their
B．that
C．who
D．whose

A.
A．their
B．that
C．who
D．whose