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（裝備）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