第二次世界大战后，西欧和日本经济迅速发展的共同原因是：[ ]
A．美国军事订货的刺激
B．都得到了美国大量的经济援助
C．都有广泛的对外经济联系基础
D．都彻底废除了封建土地制度
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| 任务性阅读。 | |
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| It is everyone's duty to protect the environment. Air pollution and 1 pollution are big problems. We should take daily actions to make the pollution 2 senous. We can control the way we choose to live and act on our neighborhood to reduce pollution. For example, if you don't litter here and there, streets will become cleaner. Also, if you don't spit on the gound 3 , the air will become 4 ; and if you ride to work instead of 5 , there will be less air pollution to protect ourselves. So let's do what we can to help protect our living environment. 任务A：用方框内所给的词的适当形式填空，使文章通顺、合理。 1._____ 2.______ 3.______ 4.______ 5.______ 任务B：根据英文释义及首字母提示，拼写单词。 6. s_____ more than two but fewer than many 7. c_____ to enjoy oneself usually for a special reason |
儿童少年心理健康的“标准”包括（）。
A.智力发展正常，情绪反应适度
B.心理行为特点和年龄相符
C.行为协调，反应能力适度
D.人际关系的心理适应
E.个性的稳定和健全
设x2+ax+b2=0是关于x的一元二次方程
（1）若a，b是分别从{1，2，3，4}，{0，1，2}中任取的数字，求方程有实根的概率．
（2）若a，b都是从区间[-1，1]中任取的一个数字，求方程有实根的概率．
15g的水溶性药物A(CRH为78%)与20g的水溶性药物B(CRH为60%)混合后，若不发生反应，则混合物的CRH为
A．23.7%
B．46.8%
C．3.9%
D．60.0%
E．69.0%
In the RGB color spaces, each pixel on the screen has a corresponding RGB value which consists of (71) components.
A．two
B．three
C．four
D．six