网络的发展促进了人们的交流，同时带来了相应的安全问题
参考答案：对
The humans are destroying nature day by day, ________ of course, will cause severe punishment from it sooner or later.
A．who
B．when
C．on which
D．which
在我国气源尚不丰富的情况下，把有限的气量供应民用比供给工用有利，理由是什么？
