单项选择题

The frequent ______ from cold to warm weather this spring have caused much illness.

A．transmissions
B．transactions
C．transformations
D．transitions
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单项选择题
As an ______ part of China, Kongkong returned to the embrace of its motherland in July, 1997.
A．explicit
B．oriented
C．integral
D．optimal
单项选择题
Huxley is ______ optimistic for the future of either man or plant on this planet.
A．anything but
B．nothing but
C．above all
D．rather than
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