M: Right, that sounds much better than standing here in the pouring rain. Thanks.

　　(Text 10)

　　Good morning, I am professor Armstrong, ⑳and I am your laboratory instructor. This class is intended as a necessary part of the course, which Dr. Smith will be in charge of it. The class will meet twice a week in this laboratory. It begins at nine. I expect you to be on time. I do not intend to wait for late-comers or report what has already been covered if you miss the explanation.

　　Do not arrive late and interrupt your neighbor. You may as well not come in if you can not be on time. Attendance is equally important. ⑱If you miss three lab classes, you’re dropped from the class, no excuses. You can’t complete the course without completing the lab class.

　　Safety is key here. It is very important to keep things neat and clean, dress properly, and be careful. You must not eat, drink or smoke in the laboratory and you should always clean the table top and wash hands before and after class. ⑲Long hair must be tied back. Large clothing must be worn. And, finally, any laboratory accident must be reported immediately.

　　I hope you will enjoy the laboratory. It’s a wonderful place but all these instructions are to be strictly followed. ⑰We will begin today by learning about the microscope.

　　1～5. BBBAA6～10. BAACC

　　11～15. CBABA16～20. CCBAA

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