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.
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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 ______.
单项选择题
A．Because engine trouble started.B．Because the runway couldn’t be seen clearly.C．Because the airport was not ready for the plane to land.D．Because some traffic accident happened at the airport.
A．Because engine trouble started.
B．Because the runway couldn’t be seen clearly.
C．Because the airport was not ready for the plane to land.
D．Because some traffic accident happened at the airport.
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