单项选择题

A．7 and half hours.
B．10hour.
C．8 and half hours.
D．8 hours.
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单项选择题
A．By predictions.B．By recording.C．Through observation.D．Through interviewing.
A．By predictions.
B．By recording.
C．Through observation.
D．Through interviewing.
单项选择题
A．That more work is necessary for those facts.B．That animals are helpless to healthy people.C．That animals can also become friends of humans.D．That they had a very successful discovery.
A．That more work is necessary for those facts.
B．That animals are helpless to healthy people.
C．That animals can also become friends of humans.
D．That they had a very successful discovery.
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