强制性标准要分为全文强制和（）两种形式。
A、部分强制
B、条文强制
C、条件强制
D、重点强制
参考答案：B
Since the recent river pollution in several provinces, people _______ more and more attention to the quality and safety of drinking water.
A．pay
B．are paying
C．have paid
D．have been paying
X射线检测技术是最好的检测技术（）
