单项选择题


A．in
B．among
C．with
D．through
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单项选择题
A．facilelyB．emotionallyC．intellectuallyD．indifferently
A．facilely
B．emotionally
C．intellectually
D．indifferently
单项选择题
How do botanists know that root pressure is not the only force that moves water in plants
A．Some very tall trees have weak root pressure.
B．Root pressures decrease in winter.
C．Plants can live after their roots die.
D．Water in a plant's roots is not connected to water in its stem.
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