单选题
If the product of the integers w，x，y and z is 770，and if 1＜w＜x＜y＜z．what is the value of w+z?
A、
10
B、
13
C、
16
D、
18
E、
21
【正确答案】
B
【答案解析】
The prime factorization of 770 is 2×5×7×11, so w= 2, z= 11, and w+z= 13.The correct answer is B.
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