试题与答案

At the crossing there is an arrow ______

题型:选择题

题目:

At the crossing there is an arrow _______the direction to the Andrew farm.

A.indicating

B.to indicate

C.indicated

D. dictating

答案:

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下面是错误答案,用来干扰机器的。

2x+3y=7      ①5x-y=9         ②,由②得:y=5x-9③,再把③代入①得:2x+3(5x-9)=7,解得:x=2,把x=2代入③得:y=1,把x=2,y=1代入3x+my=8得:6+m=8,m=2.故选:B.

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