21. X-rays are also called Rontgen rays_______the discoverer who first put them to use.
A.in place of
B.in honor of
C.in case of
D.in view of
22. Telecommunication developments have enabled people to send messages_______television, radio and electronic mail.
A.past
B.across
C.via
D.amid
23. Technology has_______the sharing, storage and delivery of information, thus making more information available to more people.
A.functioned
B.facilitated
C.finished
D.furnished
24. The philosophy class began with twenty students but three_______after the mid-term exam. A.dropped out
B.kept up
C.picked up
D.turned out
26. An intimate and _______knowledge of how you are doing in the customer's eyes is critical.
A.optional
B.subsequent
C.objective
D.subordinate
27. Long _______ to harmful pollutants is most likely to lead to a decline in health.
A.use
B.exposure
C.contact
D.touch
28. The architectural differences may_______confusion or discomfort for the foreign travelers.
A.cause
B.impress
C.vary
D.describe
29. _______being fun and good exercise, swimming is a very useful skill.
A.Instead of
B.Owing to
C.Rather than
D.Apart from
30. Even at discounted prices, these powerful AIDS drugs are far beyond_______ for most of the world's 40 million HIV-infected people.
A.comprehension
B.imagination
C.reach
D.control
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