单项选择题

A．They were frightened.
B．They kept calm and quiet.
C．They comforted each other.
D．They were uneasy.
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单项选择题
A．Because she was born there.B．Because she worked there last year.C．Because her sister vacationed there last year.D．Because her sister and her vacationed there last year.
A．Because she was born there.
B．Because she worked there last year.
C．Because her sister vacationed there last year.
D．Because her sister and her vacationed there last year.
填空题
Certain insects, such as the monarch butterfly, can incorporate poisonous substances found in food plants into their own tissues and use them as ______.
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