Sometimes the __________ (solve) to a problem is cheap and easy; sometimes it is difficult and expensive.
举一反三
- ForshipsequippedwithanSES,itis（）and（）fortheoperatortosendadistressalert. A: easy/reliable B: difficult/cheap C: stable/compulsory D: easy/expensive
- Climate change is not a(n) ________ problem to solve and it will take years. (easy / difficult)
- Climate change is not a/an _______ problem to solve and it will take years. A: difficult B: critical C: easy D: important
- 【单选题】It is () to solve A. a rather difficult problem B. rather a difficult problem C. rather difficult a problem D. a problem rather difficult
- Sometimes the __________________ is more expensive than the present itself.