单项选择题

The plumb line is always perpendicular ______ the horizontal plane.

A．with
B．from
C．at
D．to
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单项选择题
______ the foreign tourists lose their ways, the guide prepares the small cards with the address and name of the hotel.
A．In case of
B．In case
C．In any case
D．In that case
单项选择题
If human being want to enjoy the long-lasting peace and happiness, they must avoid falling into war and live in ______ with each other.
A．coincidence
B．harmony
C．uniform
D．alliance
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