单项选择题

[A] studied [C] surveyed
[B] researched [D] observed

A．studied
B．researched
C．surveyed
D．observed
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单项选择题
[A] among [C] in[B] between [D] to
A．among
B．between
C．in
D．to
单项选择题
[A] water [C] soak[B] wet [D] irrigate
A．water
B．wet
C．soak
D．irrigate
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