(2014·北京四中3月模考)It is well known that knowledge is________treasure house，but prac

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(2014·北京四中3月模考)It is well known that knowledge is________treasure house，but practice is________key to it.

A．a；the	B．the；the
C．a；/	D．/；the

答案

解析

考查冠词。句意为：众所周知，知识是宝库，而实践是开启宝库的钥匙。第一空是泛指；第二空是特指，即“开启宝库的钥匙”。
答案：　A

举一反三

(2014·安徽七校联考)It is difficult for children to change their eating habit later in life.________，parents should encourage healthy eating from an early age.

A．Otherwise	B．Therefore
C．Besides	D．However

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(2014·东北三省三校一联)Traffic conditions in Beijing________for decades.At first people only complained about jams during rush hours，but today every hour is rush hour.

A．is worsening	B．have worsened
C．have been worsening	D．worsened

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(2014·宝鸡三检)By the time the girl comes back to life，scientists probably________a cure for this incurable disease.

A．will have discovered	B．are discovering
C．will be discovering	D．have discovered

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(2013·山师大附中高考模拟)Jack________the test for further study in the USA.Let’s have a party to congratulate him.
A．passes　 B．has passed
C．has been passing　 D．had passed

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(2013·湖南省部分重点中学5月联考)—What are they up to？It’s so noisy.
—Some students________a party.

A．have had	B．are having
C．had had	D．were having

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