单项选择题

A．When it is breeding.
B．When it feels threatened by humans in its territory.
C．When its offspring is threatened.
D．When it is suffering from illness.
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单项选择题
A．Thirsty plants.B．Well-watered plants.C．Quiet plants.D．Healthy plants.
A．Thirsty plants.
B．Well-watered plants.
C．Quiet plants.
D．Healthy plants.
单项选择题
A．Those who know how to program computers.B．Those who get special aid from their teachers.C．Those who are very hardworking.D．Those who have well-educated parents.
A．Those who know how to program computers.
B．Those who get special aid from their teachers.
C．Those who are very hardworking.
D．Those who have well-educated parents.
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