Science has given clear evidence ______ smoking can lead to many diseases.
| A．what | B．which | C．that | D．where |
The chances of discovering life on Neptune are about a million _____.
| A．at one | B．for one | C．to one | D．against one |
It was _____ by the railway board that the cost of rail fares would be increased by ten percent.
| A．noticed | B．stated | C．suggested | D．noted |
Our Party has always devoted great attention to raising the living _____ of the working people.
| A．cost | B．situation | C．level | D．standard |
The map was drawn to the standard _____ of 1/100,000, so there was not much detail.
| A．route | B．line | C．rate | D．scale |
Radar enables the pilot of an airliner to take off, fly and land in _____.
| A．danger | B．comfort | C．continuity | D．safety |