99. China is the biggest _____ country, while the U.S.A is the biggest ____ country.
| A．developed; developed | B．developing; developed |
| C．developing; developing | D．developed; developing |
Whether the buildings in this area should be pulled down has remained ________; people are still looking for other possible solutions.
| A．unchallenged | B．relevant | C．controversial | D．contradictory |
Can you tell the ________ difference between the words “require” and “request”? I sometimes get puzzled by their meanings.
| A．dramatic | B．regional | C．apparent | D．subtle |
“Perhaps we need to send for Dr. Smith to see what we can do about it,” Father suggested ________ to his neighbor who had come to discuss the problem.
| A．tentatively | B．thoughtlessly | C．definitely | D．rudely |
On our journey to Australia last summer, our luggage was _____ at the customs. We were not allowed to carry food such as meat and vegetables.
| A．looked through | B．gone through | C．seen through | D．got through |
Usually a meteorological observatory (气象台) _____ air quality in urban areas from one to five: excellent, fairly good, slightly polluted, poor, and dangerous.
| A．identifies | B．purifies | C．classifies | D．clarifies |