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问题 选择题

杠杆在生产、生活中有着广泛的应用，如图所示，下列工具中属于费力杠杆的是        

 ①起子                     ②镊子                       ③筷子                 ④羊角锤

[     ]

A． ①②

B． ②③

C． ①③

D． ①④

答案

答案：B

填空题
用方框中所给单词的适当形式填空。
nine     friend     tourist     easy     beat

1. Our neighbors are always _________ to us.
2. You can find the Capital Stadium on the map _________.
3. Today is Tony's _________ birthday. Let's go to celebrate it.
4. A lot of _________ love going to Beijing for their holidays.
5. My favorite football team was _________ in the Cup Final.

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单项选择题

下列存储器中，（）速度最快。

A.硬盘

B.光盘

C.磁带

D.半导体存储器
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