单选题 Good morning. I am Professor Armstrong, and I am your laboratory instructor. This class is intended as a necessary part of the course, which Dr. Smith will be in charge of. This class will meet twice a week. This laboratory opens at nine. I expect you to be on time. I do not intend to wait for the latecomers or repeat what has already been covered if you miss the explanation. And do not arrive late and interrupt your neighbor. You may as well not come if you can't be on time.
Attendance is equally important. If you miss three lab classes, you're dropped from the labs — no excuses. You can't complete the course without completing the lab.
Besides, safety key is here. It's very important to keep things neat and clean, dress properly, and be Careful. You may not eat, drink or smoke in the laboratory and you should always clean the counter and wash your hands both before and after the class. Long hair must be tied back. Large clothing must not be worn. Any laboratory accident must be reported immediately.
I hope you'll enjoy the laboratory. It's a wonderful place, and all the requirements I've just mentioned are to be followed. We will begin today by learning about the microscope.

单选题 According to the passage how will the latecomers be treated?

A、 They will be allowed to enter the class and the teacher will repeat information for them.
B、 They had better come quietly as long as they don't interrupt their neighbor.
C、 They will be dropped from the class if they are late three times.
D、 They will not be given any special consideration.

【正确答案】 D

【答案解析】[解析] 推理判断题。根据第一段中I do not intend to wait for the latecomers or repeat what has already been covered if you miss the explanation可排除A)；根据第一段最后两句And do not arrive late and interrupt your neighbor. You may as well not come if you can't be on time可排除B)；根据第二段第二句If you miss three lab classes, you're dropped from the labs - no excuses可排除C)。故答案为D)。

单选题 According to the passage what happens if a student misses three classes?

单选题 What should you do if you wear long hair?

单选题 According to the requirements which of the following isn't right?

【正确答案】 C

【答案解析】[解析] 推理判断题。根据第三段末句Any laboratory accident must be reported immediately可知A)正确；根据第三段第三句You may not eat, drink or smoke in the laboratory...and wash your hands both before and after the class可知B)和D)正确；根据第三段第二句中的dress properly及倒数第二句Large clothing must not be worn可知C)不正确。故答案为C)。