单项选择题

A．Repeated measurements of the sizes of ants.
B．Systematic observations of ants and nests.
C．Simulated experiments on ants behavior.
D．Gathering sample nests and ants.
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A．Jack.B．Alice.C．John.D．Alex.
A．Jack.
B．Alice.
C．John.
D．Alex.
单项选择题
A．Joining a club.B．Using a timer.C．Putting the computer in the living room.D．Not spending hours uninterruptedly.
A．Joining a club.
B．Using a timer.
C．Putting the computer in the living room.
D．Not spending hours uninterruptedly.
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