服务劳动不创造()。
A、价值
B、使用价值
C、实物产品
D、价格
参考答案:C
So far a lot of man-made satellites ______ into space. [ ]
A. are being sent up
B. have being sent up
C. have sent up
D. have been sent up
简述河南省水文的基本特征。