Dividing a big problem into small problems is a t

______ we can get rid of pollution is still a big problem.A．WhetherB．IfC．thatD．what

When a spacecraft travels, one of the major problems is reentry into the Earth’s _______.A

Which is NOT a problem for those governments which have injected huge money into their eco

The problem threatening big corporations and independents is thatA．they are criticized for

If we want to solve a problem the first step is t

If we want to solve a problem the first step is t