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单选题
According to the text, the laser can ______.
A
standardize telephone cables
B
remove communications jams
C
improve the quality of human voices
D
increase the capacity of communications
参考答案
参考解析
解析：
细节题。通过关键句，原文第二段“telephone companies are now using laser light signals to transmit telephone calls through extremely small cables that are capable of carrying many more transmissions than the standard telephone cables．”可知，利用激光传递信号的声音比普通的电话电缆要多很多，这样通讯的传输能力就增强了。其他选项均不符合题意，故正确的答案为D。
细节题。通过关键句，原文第二段“telephone companies are now using laser light signals to transmit telephone calls through extremely small cables that are capable of carrying many more transmissions than the standard telephone cables．”可知，利用激光传递信号的声音比普通的电话电缆要多很多，这样通讯的传输能力就增强了。其他选项均不符合题意，故正确的答案为D。
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