皮皮学，免费搜题
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【单选题】
下列哪些是用化学方法合成的增稠剂( )A.
琼脂
B.
黄原胶
C.
果胶
D.
羧甲基纤维素钠
E.
淀粉
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【单选题】Now the pollution caused by the increasing number of cars more and more serious in many cities
A.
become
B.
became
C.
is becoming
D.
had become
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【单选题】Now the pollution in this city more and more serious with passing days.
A.
to become
B.
bec ame
C.
is becoming
D.
becoming
【单选题】Here is the ( )for paying. Please keep it.
A.
payment
B.
receipt
C.
coupon
D.
deposit
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【单选题】Now the pollution in this city more and more serious with passing days.
A.
to become
B.
became
C.
becoming
D.
is becoming
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