He failed again and again. But through his hard work, he succeeded .A. first of all B. at the beginning C. in the end D. in a short time 题目和参考答案——青夏教育精英家教网—

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He failed again and again. But through his hard work, he succeeded .

A. first of all B. at the beginning C. in the end D. in a short time

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1.Sun Wukong in Journey to the West kept________(fight)the bad people．

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US companies pay almost $10 billion a year to protect their property with alarm systems and human guards. Mobile robots may be cheaper.

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A. Because they are able to climb stairs.

B. Because they are able to send an alarm.

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C. From another robot. D. From radio signals.

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B. sense a cat crossing the room

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