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问题 多项选择题

美国神经心理学家斯佩里做割裂脑实验的时候是切断了（）。

A.网状结构

B.胼胝体

C.连接端脑和小脑之间的神经纤维束

D.连接左右两个半球的神经纤维束

答案

参考答案：B, D

填空题

Beijing: The United States and North Korea had their first ______ in four months here this afternoon as part of the ______ negotiations on how to end North Korea’s nuclear program, but diplomats played down prospects for______. James A. Kelly, assistant ______, and Kim Yong Ⅱ, North Korea’s deputy foreign minister, met ______ of formal discussions, ______ on direct dialogue that began after a stormy meeting ______ in which North Korea warned that it was moving quickly to ______ nuclear arms. The Bush administration had insisted ______ that it would only hold talks with North Korea ______ because, it argued, only ______ pressure would persuade North Korea to______. It got its way when North Korea dropped its insistence on ______ and agreed, after extensive efforts by China, to hold unusual simultaneous negotiations with ______,______,______ and ______ as well as the United States. Though Bush administration officials had not ______ talking privately with the North Koreans during______, the fact that Mr. Kelly and Mr. Kim met on the first day was seen as a sign of ______ by the American side.
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单项选择题

一般而言，下列风险当中，对商品生产者影响最大的是( )。

A．利率风险
B．商品价格风险
C．汇率风险
D．股票价格风险
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