世界上平均年降雨量最少的地方在（）
A南海诸岛
B长江流域“三大火炉”
C吐鲁番盆地
参考答案：C
—It is raining hard. Will you go to your friend’s birthday party?
—I promised him to go, but the heavy rain really places me in a ______. I’m not sure whether I will go or not.
A．disadvantage
B．conclusion
C．dilemma
D．challenge
如果关于x的方程3x+4=0与方程3x+4k=18是同解方程，则k=______．
