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【单选题】
共轭酸碱对 K a 和 K b 的关系是A.
K a × K b = 1
B.
K a × K b = K w
C.
K a / K b = K w
D.
K b / K a = K w
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【简答题】病毒是严格的 __,它只能在__ __内繁殖,其繁殖过程可分为__ _、___ __、_ ___、______和_____五个阶段。
【单选题】听力原文： It was not until one hundred and fifty years ago that scientists learned about the existence of dinosaurs. Thanks to an English doctor and his wife, the door was opened to this zoological study....
A.
Beasts.
B.
Herbivorous.
C.
Carnivorous.
D.
Dinosaurs.
【单选题】As was discussed before．it was not until the 19th century that the newspaper became the dominant pre-electronic medium．
A.
正如以前谈过，直到19世纪报纸才成为电子时代以前的主导媒体。
B.
正如以前谈过，直到19世纪报纸还没成为电子时代以前的主导媒体。
C.
正如以前谈过，19世纪后报纸才成为电子时代以前的主导媒体。
D.
正如以前谈过，直到19世纪报纸才占领电子时代以前的媒体。
【简答题】It was Monday. Mrs. Smith’s dog was hungry，but there was not any meat in the house. Thinking that there was no 46 way, Mrs. Smith took a piece of paper, and wrote the following words 47 it:“Give my do...
【单选题】Bach died in 1750,but it was not until the early 19th century his musical gift was fully recognized.
A.
while
B.
though
C.
that
D.
after
【单选题】It was not until the 18th century that man realized that the whole of the brain was involved in the working of the mind，____？
A.
was it
B.
wasn’t it
C.
did they
D.
didn’t they
【简答题】病毒是严格的寄生，它只能在活细胞内繁殖，其繁殖过程可分为（）、（）、（）、（）和（）五个阶段。
【单选题】理想与空想的区别在于( )。
A.
想是人们的主观意志和想当然
B.
会实践是科学知识产生的源泉
C.
理想变为现实，要靠实实在在的实践
D.
了坚定的信念，理想就会自动变为现实
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