正确答案: C

原始海洋中

题目：在原始地球上，原始生命产生于( )

解析：C

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举一反三的答案和解析：

[单选题]Believe it or not，the day when you can go to the moon is coming soon．You can go into space (11) space shuttle．It (12) about three days for the shuttle to go from the earth to the moon． The shuttle flies a long way to a space station． You can stay there for a short rest and then it will (13) you to the moon．Now you can jump out of the shuttle． But you mustn't take (14) your spacesuit，because it is very hot in the daytime and very cold at night on the moon． The moon is much smaller than the earth． Things are (15) 0n the moon than they are on the earth． You can jump high every time you take a step． You will find that it is never tiring to walk on the moon． You don't need to take an umbrella or a raincoat with you，(16) there is no rain on the moon You can hear (17) because there is no air on the moon． And there are no animals or(18) living things there．

by

解析：11.C【解析】构成"by+交通工具”结构，by space shuttle意为“乘航天飞机”。

[单选题]18．

was over

[单选题]下列词语的意思，解释不正确的一项是                  

坦荡如砥：宽阔得像磨刀石。

解析：

选择 B 平坦得像磨刀石一样。比喻人非常直率，不加犹豫.现多用来形容大面积的地方很平坦

[单选题]名称中有“水”字的物质可能是溶液，下列有“水”字的物质属于溶液的是

硬水

[单选题]运载火箭的主要燃料是偏二甲肼（用R表示），其反应的化学方程式为：R + 2N2O4 == 3N2 + 4H2O + 2CO2，则偏二甲肼的化学式是

[单选题]工程分析的方法中，（ ）以理论计算为基础，比较简单，但计算中设备运行均按理想状态考虑，所以计算结果有时偏低，因此这种方法的使用具有一定的局限性。

物料平衡计算法

[单选题]沙皇政府1861年改革按其内容来说是资产阶级性质的，这一结论的主要依据是（ ）

为资本主义经济发展提供了市场和劳动力 D．满足了农民获得土地的强烈愿望