下列运算中，正确的是

【名词&注释】

努力学习(learn hard)

[单选题]下列运算中，正确的是

A. x+x=2x
B. 2x－x=1
C. (x3)3=x6
D. x8÷x2=x4

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学习资料：

[单选题]24． Which is true according to the passage?

A. Jackie Chan is about forty years old．
B. He was born in America．
C. He wasn’t very successful when he first went to Hollywood．
D. He became famous at the age of 17．

[单选题]19．

A. hardly
B. good
C. hard
D. bad

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