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【单选题】
The story took place in Europe in the days before automobiles _____ everyone used horses. [ ]A.
which
B.
where
C.
when
D.
as
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反馈参考答案：
举一反三
【单选题】肉干制时也可采用微波干燥, 国际上规定( )和 2450MHz 为微波加热专用频率
A.
1500 MHz
B.
1000 MHz
C.
915MHz
D.
2000MHz
【单选题】Only united efforts can ______.
A.
make an effort
B.
make a point
C.
make a contribution
D.
make a difference
【判断题】Earth Day is the largest, most widely celebrated international environment event. Earth Day helps celebrate Earth’s unique place in the universe. It is the only planet in our solar system with incredi...
A.
正确
B.
错误
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