The Green family________ supper now. [ ]
A. has
B. have
C. is having
D. are having
答案:D
在拥有了一个故事的“起因”之后,还必须要去探寻这个“起因”的()。
A.合理性
B.优劣
C.延展性
D.真伪
哪些场所宜选择感温探测器?