Question

Doing experiments is one of the most interesting things about studying chemistry. In China, it’s often teachers who do the experiment in the front of the class with students_________. But in the US, students take action by themselves.

The first time I took a class in my school’s chemistry lab, I was surprised to find that students were wearing special glasses, plastic gloves, as if there had been a bio-chemical attack! _________is always the most important for science lab classes in America. The outfit（装备）prevents us from harmful chemical materials.

My chemistry teacher usually gives us the instruction sheet the night before the lab class to let us know a lot about the experiments. During the class, she first_________the steps of the experiments and then puts us into groups to do the experiments. What’s special is that for every lab class, she changes everyone’s partner to let us work with_________classmates.

The class is often filed with laughs. Once we tried to bum chemicals. The chemicals produced many colors of fames（火焰）, _________bright orange and dark green. Many students in my class were amazed. “Wow! That’s so beautiful! ” they screamed.

After finishing an experiment, we need to write a detailed report. It consists of the steps, our feelings and the final results. If there has been a mistake in the experiment, we need to analyze（分析）why it happened and_________we should do to correct it. The reports are important. They make up around 25 percent of our term grade.

1.A.playing B.watching C.singing D.sleeping

2.A.Fun B.Time C.Money D.Safety

3.A.wait for B.care for C.go over D.clean out

4.A.different B.same C.tall D.clever

5.A.during B.from C.through D.including

6.A.how B.what C.where D.when

Answer

1.B

2.D

3.C

4.A

5.D

6.B

【解析】

本文讲述了作者在美国学校里如何上化学实验课。

1.句意：在中国，通常是老师在学生面前做实验，学生们看着。

playing玩耍；watching观看；singing唱歌；sleeping睡觉。根据下一句“But in the US, students take action by themselves.”可知，但是在美国，学生们是自己动手做实验，but表示前后转折，所以此处是“老师做实验，学生们看着”，所以此处用watching。故选B。

2.句意：在美国，安全一直是科学实验课最重要的。

Fun乐趣；Time时间；Money金钱；Safety安全。根据下一句中“The outfit（装备）prevents us from harmful chemical materials.”可知，这套装备可以防止我们，接触到有害的化学物质，所以此处是“安全最重要”，所以此处使用safety。故选D。

3.句意：在课堂上，她首先复习了实验步骤，然后把我们分组做实验。

wait for等待；care for照顾；go over复习；clean out扫除。根据上一句中“My chemistry teacher usually gives us the instruction sheet the night before the lab class to let us know a lot about the experiments.”可知，实验课的前一天晚上，我的化学老师会给我们发一份关于实验的说明，所以此处是“开始实验之前先复习实验步骤”，所以此处用go over。故选C。

4.句意：特别之处在于，每个实验课，她都会换搭档，让我们和不同的同学一起工作。

different不同的；same相同的；tall高的；clever聪明的。根据句中“she changes everyone’s partner”可知，化学老师换了每个人的搭档，所以是“让我们和不同的同学一起工作”，所以此处使用different。故选A。

5.句意：这些化学物质产生了许多种颜色的火焰，包括亮橙色和深绿色。

during在……期间；from自从；through通过；including包括。根据句中“The chemicals produced many colors of fames”可知，这些化学物质产生了许多颜色的火焰，其中就包括亮橙色和深绿色，所以此处使用including。故选D。

6.句意：如果实验中有错误，我们需要分析为什么会发生，以及我们应该做什么来纠正它。

how怎么样；what什么；where哪里；when什么时候。根据句中do可知，此处是“我们应该做什么纠正它”，此处使用what符合题意。故选B。