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(They stand for) Good luck.
Because they eat aphids and other plant-eating pests.
They will produce an oily, yellow fluid from joints 
in their legs and remain still and pretend to be dead.
During spring and summer.
Yes, because they are pretty, graceful and harmless 
to us./No, because I am too busy with my homework 
to look after them. (答案不唯一，言之有理即可)
A
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