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【多选题】
与DNA对比,RNA的特点包括A.
分子较小,仅含几十-几千碱基
B.
是含局部双链结构的分子
C.
种类、大小及分子结构多样化
D.
功能多样性,主要是参与蛋白质的生物合成
E.
二级结构是双螺旋结构
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【单选题】听力原文： Vice President Cheney arrived at George Washington University Hospital about 8am. local time. He will be in surgery several hours, and if there are no complications, expects to return home Satur...
A.
Last year.
B.
1978.
C.
This week.
D.
Not mentioned in this report.
【简答题】Some of the notebooks George Washington kept as a young man are still in existence. They show that he was learning Latin, was very interested in the basics of good behavior in society, and was reading...
【简答题】屋面是建筑物最上层的外围护构件，用于抵抗自然界的雨、雪、风、霜、太阳辐射、气温变化等不利因素的影响，保证建筑内部有一个良好的使用环境。同时，屋顶作为建筑外形的一部分，对建筑的体型和立面形象具有较大的影响。 判断对错
【简答题】1897年英国物理学家汤姆逊(J、J Thomson)在进行阴极射线测定时候，发现阴极射线与氢离子电荷相反，但质量要比氢离子小1000多倍。后来人们把这种阴极射线微粒称为() A中子 B电子 C质子
【判断题】屋面是建筑物最上层的外围护构件，用于抵抗自然界的雨、雪、风、霜、太阳辐射、气温变化等不利因素的影响，保证建筑内部有一个良好的使用环境。同时，屋顶作为建筑外形的一部分，对建筑的体型和立面形象具有较大的影响。（）
A.
正确
B.
错误
【简答题】“Indeed，” George Washington wrote in his diary in 1985, “some kind of fly, or bug, had begun to eat the leaves before I left home.” But the father of America was not the father of bug. When Washington...
【单选题】听力原文： Ben Johnson was the name of the candidate defeated by George Washington in the 1780 presidential race. Nick-named 'The Giant of a Man, ' Johnson was massive in stature and he had a large head in...
A.
In 1784.
B.
When Johnson died.
C.
Just before the Mexican Independence War.
D.
In 177
【单选题】听力原文： Every student of American history knows that George Washington, John Adams, and Thomas Jefferson were the first three Presidents of the United States, but what else do they know about these inte...
A.
Washington, Adams arid Jefferson are most famous in the history of the United States.
B.
Washington, Adams and Jefferson had many different interests.
C.
Washington, Adams and Jefferson returned home after they were retired.
D.
Washington, Adams and Jefferson were the first three Presidents.
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