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[单项选择]
Text 3
The marvelous telephone and television network that has now enmeshed the whole world, making all men neighbors, cannot be extended into space. It will never be possible to converse with anyone on another planet. Even with today’s radio equipment, the messages will take minutes—sometimes hours—on their journey, because radio and light waves travel at the same limited speed of 186,000 miles a second.
Twenty years from now you will be able to listen to a friend on Mars, but the words you hear will have left his mouth at least three minutes earlier, and your reply will take a corresponding time to reach him. In such circumstances, an exchange of verbal messages is possible—but not a conversation.
To a culture which has come to take instantaneous communication for granted, as part of the very structure of civilized life, this "time barrier" may have a profound psychological impact. It will be a perpetual reminder of universal
A. a year
B. nearly a day
C. two months
D. thirty minutes
[单项选择]The marvelous telephone and television network that has now enmeshed the whole world, making all men neighbors, cannot be extended into space. It will never be possible to converse with anyone on another planet. Even with today’s radio equipment, the messages will take minutes—sometimes hours—on their journey, because radio and light waves travel at the same limited speed of 186, 000 miles a second.
Twenty years from now you will be able to listen to a friend on Mars, but the words you hear will have left his mouth at least three minutes earlier, and your reply will take a corresponding time to reach him. In such circumstances, an exchange of verbal messages is possible—but not a conversation.
To a culture which has come to take instantaneous communication for granted, as part of the very structure of civilized life, this "time barrier" may have a profound psychological impact. It will be a perpetual reminder of universal laws and limitations against which not all our technol
A. a year
B. nearly a day
C. two months
D. thirty minutes
[单项选择]Text
Most radio and television stations in the United States are commercial stations, (26) is to say, they earn their money from (27) or commercials. Private companies purchase radio and television (28) from the commercial stations in order to (29) their products. Cable television stations are also (30) stations, though they do not usually have advertisements. (31) watch cable stations, people must pay the cable TV company a certain amount of money each (32) .
Public radio and television stations, on the (33) hand, do not have advertisements and people do not have to (34) to watch them. These stations gain their money (35) the government, private companies, and from some of the (36) who watch or listen to their programs. The (37) government and some large corporations give (38) , large gifts on money, to the public stations. Small businesses and peop
A. programs
B. projects
C. nets
D. networks
