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问题 单项选择题

下列关于有效数字说法错误的是（）。

A、有效数字就是实际能测得的数字

B、有效数字就是保留末一位不准确数字，其余数字均为准确数字

C、有效数字反映测量的准确度

D、有效数字保留的位数与分析方法和仪器准确度无关

答案

参考答案：D

听力题

Everyone needs friends. We all like to feel close to someone. We can share 小题1:s      with our friends and turn to them for help when we are in trouble. In a word, it is nice to have a friend to 小题2:t     , laugh and do things with. Certainly, sometimes we need to be alone. We don’t always want people around. But we would feel 小题3:l      if we never had a friend.

To make 小题4:f     , you must be friendly. A cheerful person smiles. A smile always makes the others like you. Smile at someone and you are sure to get a smile小题5:b      from him.

Try to remember names. It小题6:m      your new friends feel happy when you call them by their names, 小题7:b      you don’t forget them.

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单项选择题

( )，11，9，9，8，7，7， 5，6

A．10

B．11

C．12

D．13
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