单项选择题

What are those Americans concerned about when they are planning the trip up Mount Everest()

A. The success in climbing up the mountain.
B. The environmental pollution of the mountain.
C. The equipment for their trip to the mountain.
D. The risks facing the climbers of the mountain.

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单项选择题

It is necessary that Tom () all the blanks on an application for a job.

A. fill
B. filled
C. fill with
D. filling

单项选择题

By using the example of fingerprints, the author tells us that ()

A. people can learn to recognize faces
B. people have different personalities
C. people have difficulty in describing the features of fingerprints
D. people differ from each other in facial features