单项选择题

She claims to be very learned in biochemistry, but in fact ______ she knows about it is all sadly out of date.

A．so little
B．that much
C．what little
D．how much
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单项选择题
Most insulation devices of this kind, ______ manufactured for such purposes, are extremely expensive to install.
A．that are
B．which is
C．those are
D．as are
单项选择题
The English vocabulary is known for a(n) ______ of words which are comparatively seldom used in ordinary conversations.
A．multitude
B．altitude
C．latitude
D．platitude
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