单项选择题

Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20.
According to the speaker, why was it a problem for mail carriers to cross rivers in 1600s

A．Boats used on rivers were extremely crowded.
B．The current was too swift for boats to cross easily.
C．The bridges were too weak to carry the weight of a stagecoach.
D．Ferry service was infrequent.

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尽管我们可能不愿承认，但电视广告和杂志广告对我们的影响可能比我们想像的要大得多。

单项选择题

What does the author probably foresee

A．Readers will have more accesses.
B．Books and newspapers will be kept as computer files.
C．It will not make any sense to keep the printed versions.
D．Electronic publications will replace printed ones.

Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20. According to the speaker, why was it a problem for mail carriers to cross rivers in 1600s 您的浏览器不支持 audio 元素。

Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20.
According to the speaker, why was it a problem for mail carriers to cross rivers in 1600s