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【判断题】
蛋白质种类很多,但组成蛋白质的氨基酸主要只有20种。A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Only a very delicate thermometer can ________ such tiny changes in temperature in a precise way.
A.
count
B.
relate
C.
measure
D.
number
【简答题】pH=13的强碱溶液和pH=2的强酸溶液混合，所得溶液的pH=11，则强碱溶液和强酸溶液的体积之比为多少？
【单选题】Our earth, one planet of the solar system, is only a very small part of the__________.A．univers
A.
282. Our earth, one planet of the solar system, is only a very small part of the__________. A．universal
B.
university
C.
universe
D.
Union
【简答题】阅读理解。 Bill Gates is the richest person in the world. He's not only a very famous computer scientist but also a very successful businessman. Bill's father was a successful lawyer and his mother was a h...
【单选题】Although about ______ of the earth is covered with water, only a very small amount of it is drinkable. [ ]
A.
seven-tenth
B.
seven tenths
C.
seven-tenths
D.
seven-tens
【单选题】____ we get on well with a number of people , we are usually friends with only a very few．
A.
As
B.
Once
C.
Before
D.
While
【简答题】第 4 章书本上的作业: P113 : 4-3, 4-4, 4-7 , 4-8, 4-10 。
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