A US coal producer agreed to pay ________ total of $ 209 million for the mining accident that killed 29 people，________ worst such disaster in 40 years in the US.

A．the；the

B．a；a

C．the；a

D．a；the

根据下列漫画，结合课文知识回答：

（1）漫画中充满勃勃生机和活力的《长青树》昭示了我国实行什么政策？

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（2）结合课文知识说明改革开放是我们国家发展进步的活力源泉。

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（3）请列举厦门实行改革开放的典型事例2个。

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