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A．Dr Scott Macleod
B．Dr. Chen Zhili
C．Mary Smith
D．Dr. Saul Lloy
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单项选择题
A．Peter Gade.B．Ji Xin peng.C．Xia Xuanze.D．Chen Hon
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A．further actions to force speeds upB．further actions to force speeds downC．no further actions to force speeds upD．no further actions to force speeds down
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