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单选题
In quadrilateral ABCD, ∠A+∠C is 2 times ∠B+∠D. If ∠A=70, then ∠B= ______.
A

60

B

80

C

120

D

240

E

It cannot be determined from the information given


参考答案

参考解析
解析:
70+∠C=2(∠B+∠D., 70+∠C+∠B+∠D=360. 2(∠B+∠D.+ (∠B+∠D.=360. (∠B+∠D.=120. It is not possible to find the measure of ∠B.
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