综合解释一般砂岩类油气层，主要根据测井密度和（）曲线，结合录井资料识别出含气层。
A、井径
B、补偿中子
C、自然电位
参考答案：B
------ Taking a walk in the evening is a good ______ .
------ So it is .It keeps us healthy.
A．habit
B．hobby
C．time
D．rule
It's time I________to thinking about my future. [ ]
A. got down
B. went down
C. broke down
D. came down
