As an exchange student, I studied in France for two years. The first time I took a class in the chemistry lab, I was surprised to find that students were fully “armed”. Everyone was wearing goggles(护目镜) and gloves. Safety comes first for science lab class.

My chemistry teacher Mrs. Louise usually gave us the instruction paper the night before the lab class and let us read it. During the class, she first went over the steps and then put us into groups of two to do the experiments(实验). What was special was that for every lab class, Mrs. Louise changed everyone's lab partner to make them work with different classmates.

The class was often filled with laughter and screams(尖叫). We once tried to burn the chemicals and watch the colors of the flames(火焰). Different chemicals produced different colors of flames,including bright orange and dark green. Many students in my class were surprised. “Wow! That's so beautiful!” they screamed. Then they excitedly took pictures, posted them online and sent them to their friends. Mrs. Louise didn't get angry with us at all for our “noises”. She herself even took photos with us!

After finishing an experiment, we had to write a lab report. If we had a big mistake in the experiment, we needed to analyze(分析) why it happened and what we should do to avoid it next time. The lab reports were very important. They made up around 25% of our term grade.

41.How did the writer feel when he first took the chemistry class in the lab?

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42.Why did Mrs. Louise change everyone's lab partner in every lab class?

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43.Was Mrs. Louise angry with the students for their “noises”?

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44.What did the students have to do after finishing an experiment?

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45.What do you think of Mrs. Louise's lab class?

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答案解析：

41.根据文中“The first time I took a class in the chemistry lab, I was surprised to find that students were fully ‘armed’.”可知，作者第一次在实验室上化学课时感到很惊讶，所以答案是He was surprised。

42.根据文中“What was special was that for every lab class, Mrs. Louise changed everyone's lab partner to make them work with different classmates.”可知，路易丝夫人在每节实验课上都更换每个人的实验搭档是为了让他们和不同的同学一起合作，所以答案是To make them work with different classmates。

43.根据文中“Mrs. Louise didn't get angry with us at all for our ‘noises’.”可知，路易丝夫人并没有因为学生们的“吵闹”而生气，所以答案是否定的，即No, she wasn't。

44.根据文中“After finishing an experiment, we had to write a lab report.”可知，学生们在完成实验后必须写一份实验报告，所以答案是They had to write a lab report。更多真题请微信搜索英语巴士小程序。

45.根据文中描述，实验课上充满了笑声和尖叫，学生们可以亲手做实验并观察火焰的颜色，这说明课程很有趣;同时，实验后需要写实验报告，分析实验中的错误并思考如何避免，这又体现了课程的教育性。所以可以认为路易丝夫人的实验课既有趣又有教育意义，答案可以是It's interesting and educational。(答案不唯一，合理即可)