One of the most important features that distinguish reading from listening is the nature o

f the audience.【67】the writer often does not know who will read what he writes, he must【68】to be as clear as possible. Time can be taken to plan the piece of writing so that it is eventually organized into some sort of【69】sequence of events or ideas. When we speak, however, we normally have very little time to plan what we【70】to say. Since we are actually【71】our audience face to face we may【72】some of the information we believe our audience shares. And the more【73】we are with our audience, the more information we are likely to leave out. In any【74】they can always stop and ask a question or ask for【75】if we have left out too much. A reader, however, cannot do this but can at least attempt comprehension at his own speed;【76】, he can stop and go backwards or forwards,【77】to a dictionary or just stop and rest. When we listen we may have to work hard to【78】out the speaker's thoughts by referring backwards and forwards while the speaker continues. As the speaker【79】to organize his thoughts, he will use Filler phrases to give him time to plan. In spite of these fillers, he will【80】make mistakes and repeat what he has already said. His speech will be characterized【81】a limited range of grammatical patterns and vocabulary and the use of idioms to【82】some general meaning quickly. It should be clear, then, that the listener has to take an active【83】in the process by ignoring the speaker's【84】and mistakes, and by seeking out the main idea information through recall and prediction. To keep the process going【85】he also has to inform. the speaker that he has understood【86】actually interrupting.

(68)

A．However

B．Since

C．Although

D．Unless