The survival of civilization as we know it is ________ threat.
举一反三
- The car, at least as we know it, is on the way out, because its exhaust ______ a threat to the environment.
- (5 Cross) These small arms and light weapons also ______ another threat. (to create a threat, problem, etc. that has to be dealt with)
- We love peace， yet we are not the kind of people to yield ________ any military threat.
- We will not find megalodon, but we might find the key our survival on Earth.
- Exhaust fumes are a threat to the _____________ to the air we breathe.