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【单选题】
“阶级斗争不是推动历史的唯一动力,因为如果阶级斗争是推动历史的唯一动力,那么蒸汽机就一定是阶级斗争的产物,科学技术的进步也一定是阶级斗争的产物,而人类的发展史证明,并不是这样。”这段话的论点是( )。A.
阶级斗争不是推动历史的唯一动力
B.
因为如果阶级斗争是推动历史的唯一动力，那么蒸汽机就一定是阶级斗争的产物……
C.
而人类的发展史证明，并不是这样
D.
并不是这样
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【单选题】根据以下资料，回答20~23题。 At the first sight the planet Mars does not appear very welcome to any kind of life．It has very little oxygen and water, the temperature at night is below -50~Cand winds of 100 miles ...
A.
there is no life there now
B.
there is a large amount of water at the poles
C.
the Mars may be able to support life in the future
D.
conditions may have been similar to those on the Earth
【单选题】At the first sight the planet Mars(火星)does not appear very welcome to any kind of life. It has very little oxygen and water, the temperature at night is below -50°C and winds of 100 miles per hour cau...
A.
there is no life there now
B.
there is a large amount of water at the poles
C.
the Mars may be able to support life in the future
D.
conditions may have been similar to those on the Earth
【单选题】以下哪个选项描述了克莱门森(Clemmensen)反应?( )
A.
无α-H的芳香醛与具有α—H的脂肪族醛酮进行交叉缩合反应脱水形成α，β-不饱和醛、酮的反应
B.
羰基在锌汞齐浓盐酸作用下，被还原为亚甲基的反应
C.
将醛、酮和肼反应生成腙，再与金属钠或钾在封管或高压釜中加热至较高温度后，把羰基还原为亚甲基的反应
D.
无α-H的醛在浓碱条件下，一分子的醛氧化为羧酸盐，另一分子的醛还原为醇的反应
【简答题】For many years scientists have said that the earth is getting warmer. Now they have found something new-hot cities! In the southern US, they have found that cities become very hot in summer. For examp...
【单选题】听力原文： If you've been on campus for very long, I'm certain that you've already heard about this course. You may know that last semester about 50 percent of the students enrolled in my course failed it....
A.
10 points.
B.
2 points.
C.
15 points.
D.
5 points.
【简答题】If you often have a cold, headache or backache, there is something wrong with your health. Eating healthy food 43 good for our health. Tofu（豆腐）, milk, vegetables are healthy for us. Tofu is a kind of ...
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