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【单选题】
下列对应关系是从集合M到集合N的一一映射的是（ ）A.
M=N=R，f：x→y=- 1 x ，x∈M，y∈N
B.
M=N=R，f：x→y=x 2 ，x∈M，y∈N
C.
M=N=R，f：x→y= 1 |x|+x ，x∈M，y∈N
D.
M=N=R，f：x→y=x 3 ，x∈M，y∈N
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【单选题】—There are so many flowers on ___________ side of the street． —Yes．I hope that all the flowers belong to _______________．
A.
every；me and you
B.
either；you and me
C.
both；you and I
D.
each；I and you
【单选题】There are a lot of colorful flowers on __________ side of the street.
A.
all
B.
both
C.
either
D.
every
【单选题】Guiyang is a beautiful and clean city. There are many flowers on ____ side of the streets. A . either B. neither C. both
A.
either
B.
neither
C.
both
D.
none
【简答题】识读《入境货物报检单》填制范本,完成下列练习:
【单选题】There are many flowers on ________ side of the street . A. either B. both C. every
A.
either
B.
both
C.
every
【单选题】There are some flowers on ___________ side of the road.
A.
each
B.
every
C.
both
D.
all
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