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【单选题】
既可以使溴水褪色,又可以使高锰酸钾褪色的是( )A.
丙烷
B.
2-甲基
C.
D.
丙烯
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反馈参考答案：
举一反三
【简答题】这种聚合物的分子结构形式,称为( ),由它所构成的塑料一般称为( )。
【单选题】The main idea of this passage is that ______.
A.
light causes sea color
B.
sea coloration is varied because of a combination of length of light waves and microscopic plant life and silt
C.
microscopic plant life causes sea color
D.
water composition causes sea color
【单选题】Which of the following titles best illustrate the idea of the passage?
A.
Nutritious Food
B.
Varieties of Cheese
C.
A Concentrated Source of Nutrients
D.
Cheese
【单选题】Which of the following statements best expresses the main idea of the passage?
A.
Glass is very useful because it has many unusual qualities.
B.
Light signals have changed the use of glass in industry.
C.
Glass fibers have reduced the cost of telephone communication.
D.
The use of glass fibers to carry telephone messages is an interesting new development.
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