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【单选题】
下面各组数中,互为倒数的是(  )
A.
0.5和 1 2
B.
5 4 和0.8
C.
0和0
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【简答题】下面四个命题: ①偶函数的图象一定与y轴相交; ②奇函数的图象一定通过原点; ③偶函数的图象关于y轴对称; ④既是奇函数又是偶函数的函数一定是f(x)=0(x∈R). 其中正确命题的序号是(    )。
【单选题】The new exhibition at Wharton Gallery on Foxton Street ______ the work of local artist Ravi Ashankar.
A.
elaborates
B.
showcases
C.
pictures
D.
occupies
【单选题】The High Street is so narrow that the local government has decided to ______ it.
A.
increase
B.
lengthen
C.
widen
D.
extend
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A.
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B.
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C.
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A.
small
B.
very small
C.
smaller
D.
smallest
【单选题】下面四个结论: ①偶函数的图象一定与y轴相交;②奇函数的图象一定过原点; ③偶函数的图象关于y轴对称;  ④没有一个函数既是奇函数,又是偶函数。 其中正确的命题个数是 [     ]
A.
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B.
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C.
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D.
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A.
What
B.
Why
C.
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