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3．A． B． C．
4．A． B． C．
5．A． B． C．
二、对话理解（每小题1分，共5分）
本题共有五个小题，每小题你将听到一组对话和一个问题。请从每小题所给的A、B、C三个选项中，选出一个最佳选项，并在答题卡上将该项涂黑。
6．A．Jack. B．Jill. C．Jimmy.
7．A．Twice a week. B．Three times a week. C．Every day.


Everyone has a“superpower”.He or she doesn't need to speak, but we can tell _______66_______ the person is happy, angry or sad.We do so by _______67_______ at his or her face!
The human face has about 40 muscles(肌肉).Together, they make _____68____ of expressions.These
expressions ______69______ show our feelings can help us communicate with others.Some
expressions last less than half a second.They are _______70_______ micro expressions (微表情).They
can better show what people think and how they feel.Here are some examples of micro expressions.
Nervous people always have red faces _______71_______ the blood goes to their faces when they are nervous.Liars usually open and close their eyes very _______72_______.This helps them make up stories.A real _______73_______ often makes the eyes smaller.This is because more muscles are used when a person is happy.When a person has a fake smile, his or her eyes don't change.
Animals have expressions, too.When the owner blames the dog for its mistakes, the dog may show a “sorry” expression.When a horse shows its _______74_______, it is not smiling.It is actually not feeling very well and needs a rest. _______75_______ interesting the expressions are! Try to find out more about them by yourself.


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①pH的定义：pH是c(H＋)的负对数，其表达式是pH＝－lg c(H＋)
②pH的意义：pH越大，溶液的碱性越强；pH越小，溶液的酸性越强
③溶液酸碱性与pH的关系(常温下)：pH＜7，为酸性溶液；pH＝7，为中性溶液；pH＞7，为碱性溶液
④pH的适用范围：1×10－14 mol·L－1≤c(H＋)≤1 mol·L－1
【点拨】①酸性(碱性)溶液并不一定是酸类(碱类)物质
②判断溶液的酸碱性不能根据c (H+)和c (OH –)绝对大小，而应比较二者相对大小，不受温度影响
③溶液的酸碱性也不能根据pH来判断，如：pH=7的溶液不一定为中性溶液，100℃时，pH=6为中性溶液


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