单选题
Suppose V1=，V2=，where R is the set of real numbers，+， and are respectively addition and multiplication. Let f: R→R and f(x)=ex，
which of the following propositions is true?
A、
f is a surjective homomorphism from V1 to V2
B、
f is an injective homomorphism from V1 to V2
C、
f is an isomorphism from V1 to V2
D、
None of the above
【正确答案】
B
【答案解析】
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