某校实验老师需配制0．01 mol/L的KMnO4消毒液，下列操作导致所

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问题选择题

某校实验老师需配制0．01 mol/L的KMnO₄消毒液，下列操作导致所配溶液浓度偏高的是

A．取KMnO₄样品时不慎在表面沾了点儿蒸馏水

B．溶解搅拌时有液体飞溅

C．定容时俯视容量瓶刻度线

D．摇匀后见液面下降，再加水至刻度线

答案

答案：C

阅读理解

Read and judge. 读短文，判断正“T”误“F”。

Hello! My name is Amy. Today I go shopping with my mum. I need to buy a pair of new shoes. Because

(因为) my old shoes are too small. In the shop, I try on (试穿) a pair of black shoes. They're too big. Then I see

a pair of red shoes. They're just right. I like them. Red is my favourite colour. My mum buys them for me.

1. Today my mum and I go shopping. ( )

2. I buy a pair of black shoes. ( )

3. I need a new pair of pants. ( )

4. My favourite colour is red. ( )

5. I like my new shoes. ( )

填空题

行车制动在产生最大制动效能时的踏板力，对于乘用车不应大于（）N；对于其它机动车不应大于（）N。