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【单选题】
常温下有体积相同的四种溶液：①pH=3的CH 3 COOH溶液；②pH=3的HCl溶液；③pH=11的氨水；④pH=11 的NaOH溶液。下列说法正确的是 [ ]A.
②和③混合，所得混合溶液的pH大于7
B.
③与④分别用等浓度的硫酸中和，消耗硫酸的体积：③=④
C.
①与②分别与足量的镁粉反应，生成H 2 的量：①
D.
若将四种溶液稀释100倍，溶液的pH大小顺序是：③>④>①>②
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A.
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A.
the climate of the world should be becoming cooler
B.
it will take thousands of years for the inertia of the earth's climate to take effect
C.
the man-made warming effect helps to increase the solar effect
D.
the new Ice Age will be delayed by the greenhouse effect
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【简答题】目标管理及其优缺点是什么?
【单选题】On the basis of their models, scientists are of the opinion that______.
A.
the climate of the world should be becoming Cooler
B.
the new Ice Age will be postponed by the greenhouse effect
C.
the warming effect helps to increase the solar effects
D.
inertia of the earth's climate to take effect in thousands of years
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