单项选择题

In order for one to achieve the desired results in this experiment, it is necessary that (he) (work) as (lastly) (as) possible.

A．he
B．work
C．lastly
D．as
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单项选择题
The differential attractions of the sun and the moon (have) a direct effect (in) the (rising) and falling (of) the tides.
A．have
B．in
C．rising
D．of
单项选择题
Psychology Today (is) (interesting), informative, and (it is) easy (to read).
A．is
B．interesting
C．it is
D．to read
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