SOME PEOPLE THINK GREAT STRIDES HAVE BEEN MADE IN CLEANING UP THE...

67. - TRAC NGHIEM TIENG ANH 12 UINT 9
TRAC NGHIEM TIENG ANH 12 UINT 9

67. Some people think great strides have been made in cleaning up the environment in much of the world.

A B

Therefore, others think the situation is much worse than it was twenty years ago.

C D