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问题 选择题

Disney is a great place for children ________.[ ]

A．for play                  

B．to play

C．playing                  

D．play

答案

答案：B

选择题

— Excuse me, sir. ________ either she or I selected to join the team?

— Sorry, neither she nor you ________. [ ]

A. Am; are  

B. Is; are

C. Are; are  

D. Is; is
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单项选择题

氧分压下降对呼吸的影响是

A．氧分压越低呼吸中枢兴奋性越高

B．缺氧直接兴奋呼吸中枢

C．缺氧是维持呼吸的经常性生理性刺激

D．缺氧通过外周化学感受器使呼吸抑制

E．缺氧直接抑制呼吸中枢
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