【題目】 CT is really useful invention, with which doctors can find out what's wrong with a patient more easily.

A. A; a B. The; an C. The; a D.A ;the

【答案】C

【解析】句意：CT是一種有用的發(fā)明，醫(yī)生可以依靠它很容易地找到病人哪里出毛病了。指科技發(fā)明一般用定冠詞the；一種有用的發(fā)明，應(yīng)用不定冠詞，useful以輔音音素/j/開(kāi)頭，故用a。故選C。

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