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问题 选择题

在一片动物种类繁多的森林中，消费者、分解者的种类和数目基本稳定，下列各项中与之不符的是 [ ]

A．能量流动和物质循环保持相对稳定

B．食物链和食物网保持相对稳定

C．各类生物所含的能量值基本不变

D．各种群年龄组成维持增长型

答案

答案：D

填空题

Washington: The Bush administration has ______ for the first time that it may be willing to ______ a multinational force in Iraq to operate under the ______ of the United Nations as long as ______ by an American. The idea was described by Richard L.Armitage, the deputy secretary of state, as just"______" in discussions at the United Nations. It was first ______ publicly last week by Kofi Annan, the United Nations’ secretary general. Mr. Armitage’s remarks, made ______ to regional reporters and released by ______ today, represent ______ in course for the administration, which has until now insisted that all ______ matters in Iraq remain under total American control. Allowing the United Nations ______ would be intended to win the support of the Security Council for ______ authorizing the occupation of the country. In his remarks, Mr. Armitage ______ to discuss the plans ______, saying, "I don’t think it helps to ______ publicly fight now." But he described the arrangement under consideration as "a multinational force ______ "in which "the American would be the U.N. commander." On Monday, Defense Secretary Donald H. Rumsfeld was asked whether he could ______ American troops fighting ______ . His answer: "I think that’s not going to happen." But he went on to rule out only ______ meaning by the United Nations, whose troops wear blue helmets over a peacekeeping force in Iraq.
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单项选择题

下列哪项不是吗啡引起呼吸抑制的原因（）

A.抑制呼吸肌功能

B.提高呼吸中枢对C02的反应性

C.兴奋脑桥呼吸调整中枢

D.增加颈动脉体和主动脉体化学感受器对缺氧的反应性

E.激动受体
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