The conference has been held to discuss the effects of tourism ________ the wildlife in the area
| A．in | B．on | C．at | D．with |
29._____ to sunlight for too much time will do harm to one’s skin.
| A．Exposed | B．Being exposed | C．Having exposed | D．To expose |
28.The police were trying to _____ the suspect’s motive of killing his wife.
| A．single out | B．catch on | C．stop off | D．figure out |
27.Influenced by the economic crisis, the rate of unemployment in big companies has risen in the last 3 months , _____ 10 percent in average.
| A．have reached | B．reaching | C．to reach | D．to be reaching |
26. According to the arrangement, the newly-elected president _______a speech to his supporters from 8 to 10 o’clock tomorrow morning .
| A．is giving | B．will be giving | C．gives | D．will have given |
25.Selecting a mobile phone for personal use is no easy task because technology _____so rapidly.
| A．is changing | B．has changed | C．will have changed | D．will be changing |