[单项选择]When a decision has finally been made, we obtain a ______ and do a full search of the place, taking away my material that might be required as evidence.
A. authority
B. entitlement
C. warrant
D. validity

When an invention is made, the inventor has three possible 61 of action open to him; he can give the invention to the world by publishing it, keep the idea 62 , or patent it.A 63 patent is the result of a bargain 64 between an inventor and the state, but the inventor gets a limited period of monopoly and publishes full details of his invention to the public after that period 65 .
Only the most exceptional circumstances 66 the lifespan of a patent 67 to alter this normal process of events.
The longest extension ever 68 was to Georges Valensi; his 1939 patent for color TV receiver circuit was extended until 1971 because for most of the patent’s normal life there was no color TV to 69 and thus no hope for reward for the invention.
Because a patent remains permanently 70 after it has terminated, the shelves of the library attached to the 71 office contain details of literally mi
A. granted
B. granting
C. to grant
D. being granted