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Questions 11 to 18 are based on the conversation you have just heard.

A. She let the man use her books for the weekend.
B. She brought the books the man asked for.
C. She borrowed the books from the man.
D. She offered to help the man.

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以下结论正确的是( )．

A. 函数f(x)的导数不存在的点，一定不是f(x)的极值点
B. 若x0为f(x)的驻点，则x0必为f(x)的极值点
C. 若f(x)在点x0处连续，则f(x)在x0处一定可导
D. 若f(x)在点x0处有极值，且f’(x0)存在，必有f’(x0)=0

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Questions 11 to 18 are based on the conversation you have just heard.

A. She feels it difficult to communicate with her new classmates.
B. She has to do much homework.
C. She has a hard time to understand her new classmates.
D. She has to get to know many new classmates.

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有一河流干流规划建设梯级电站。该河流水量丰沛，河床坡降陡，自然落差大。规划涉及河段山高谷深，耕地少而分散，且多系坡地，河滩地较少。规划区域对外交通条件差，人类活动少，对泾流量的影响及水资源需求量极为有限。规划河段长157.5km，天然落差1235m，平均比降7.84‰。规划范围涉及8个乡，规划河段推荐采用“一库六级”开发方案。根据以上内容，回答以下问题。该规划环评应以( )内容为主。

A. 水环境
B. 生态环境
C. 社会环境
D. 大气环境

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Wetlands are some of the most biologically productive natural ecosystems in the world, comparable to tropical rain forests and coral reefs in their productivity and the diversity of species they support.

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Questions 11 to 18 are based on the conversation you have just heard.

A. She let the man use her books for the weekend. B. She brought the books the man asked for. C. She borrowed the books from the man. D. She offered to help the man.

以下结论正确的是( )．

Questions 11 to 18 are based on the conversation you have just heard.

Wetlands are some of the most biologically productive natural ecosystems in the world, comparable to tropical rain forests and coral reefs in their productivity and the diversity of species they support.

A. She let the man use her books for the weekend.
B. She brought the books the man asked for.
C. She borrowed the books from the man.
D. She offered to help the man.