经典脑筋急转弯 说它是牛不是牛，力小能背房子走。（打一动物）（）

当边际收益递减时，总变动成本将： A．按递增的速度递减 B．按递增的速度递增 C．按递减的速度递减 D．按递减的速度递增

A.按递增的速度递减

B.按递增的速度递增

C.按递减的速度递减

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What do we learn about paid family leave from the first paragraph?（）

A．America is now the only developed country without the policy.
B．It has now become a hot topic in the United States.
C．It came as a surprise when Australia adopted the policy.
D．Its meaning was clarified when it was established in Australia.

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