单项选择题

In the experiment we kept a watchful eye ______ the developments and recorded every detail.

A．in
B．at
C．for
D．on
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单项选择题
Most children in Great Britain are educated at the public ______.
A．cost
B．payment
C．expense
D．charge
单项选择题
Anyone who has spent time with children is aware of the difference in the way boys and girls respond to ______ situations.
A．similar
B．alike
C．same
D．likely
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