A ________ usually takes a long time to develop before being put on the market.（　?。?/h1>

A．course

B．speech

C．product

D．direction

【考點(diǎn)】名詞詞義辨析．

【答案】C

【解答】

【點(diǎn)評(píng)】

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發(fā)布：2024/5/27 14:0:0組卷：127引用：1難度：0.5

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A．instruction	B．description
C．collection	D．expression

1．"WeChat"（微信） really makes a great _______ to people's life．It's easy for us to keep in touch with others．（ ?。?/h2>