2011年全国中考英语真题汇编：阅读选择型(21)

中考英语

LABORATORYRULES

Throug

hout the

lesson

Before

the

Experiment

During

the

Experiment ·Read all instructions carefully before every experiment. ·Prepare all apparatus（仪器）and arrange them so that you will not knock them over while doing the experiment. ·If you are unsure of how to use any apparatus or how to operate, ask your teacher for help. ·Never smell or taste chemicals unless your teacher gives

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