单项选择题

The science of horticulture ______ the primary concerns are maximum yield and superior quality, utilizes information derived from other sciences.

A．in that
B．in which
C．which is
D．which
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单项选择题
One should never lose one's heart when ______ with temporary difficulties.
A．to confront
B．confronted
C．confronting
D．confront
单项选择题
So little ______ about mathematics that the lecture was completely beyond me.
A．I know
B．I knew
C．do I know
D．did I know
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