Scientific findings come about as a result of painstaking efforts and long periods of______.
A: conspiracy
B: contamination
C: contemplation
D: contradiction
A: conspiracy
B: contamination
C: contemplation
D: contradiction
举一反三
- At first, the __________ of color pictures over a long distance seemed impossible, but, with painstaking efforts and at great expense, it became a reality. A: transaction B: transmission C: transformation D: transition
- What is the author's view of "instant" scientific discoveries A: They occur with long intervals. B: They occur in quick succession for a long period. C: They require long periods of time to be confirmed. D: They are never made easily, but through long years of intense work and persistence.
- 8. This is not_______they had expected after years of painstaking research. A: a result as bad as B: as a result as bad C: as bad as a result D: as bad a result as
- 2. Poor grades are usually the result of______.
- A: The queen of England is old.B: England has a queen.A and B have the relation of______. A: presupposition B: entailmemt C: synonymy D: contradiction