单项选择题

A rigorous alertness (must be) (adhered) when (notetaking) with the inessential ignored (and) the superfluous eliminated.

A．must be
B．adhered
C．notetaking
D．and
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单项选择题
He (stood) on tiptoe, (stretching) as far as he could, (however), still, he (could not reach) the book.
A．stood
B．stretching
C．however
D．could not reach
单项选择题
It is (largely) through perspiration, (or) the evaporation of water (through) the pores, that humans(rid them) of excess moisture.
A．largely
B．or
C．through
D．rid them
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