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题型:阅读理解-单选 难度:0.65 引用次数:176 题号:8936515

One Monday morning, Paul and his classmates were in the science laboratory for their chemistry lesson. The students were going to work in pairs to do an experiment. Before they began, the teacher gave them this description of the different stages of the experiment.

Stage 1: Prepare the equipment: a test tube, a crucible(坩埚), a Bunsen burner(煤气灯)and tongs(钳子).

Stage 2: Weigh 5 grams of baking soda (小苏打) and put it in a crucible.

Stage 3: Heat 10 ml of hydrochloric acid (盐酸) in a test tube.

Stage 4: Pour the warm acid onto the baking soda and continue to heat the mixture.

Result: The acid reacts with the bicarbonate(碳酸氢盐)to form water, carbon dioxide gas and salt.

The hotter the mixture, the quicker the reaction. Continue to heat the mixture until the water evaporates(蒸发), leaving the salt in the crucible.

Paul and his partner followed the instructions and set up their equipment. Paul went to the cupboard to get a bottle of hydrochloric acid. He found that there was only one bottle in the cupboard so he took that. There was no label on the bottle and Paul didn’t check with the teacher if it was the right solution(溶液).

He measured the liquid and poured it into a test tube. Using tongs to hold the test tube, he heated it over the Bunsen burner. That’s when things started to go wrong. The liquid in the test tube was not hydrochloric acid. When it was heated, it formed a thick cloud of white gas. Soon the room was full of this strong smelling white gas.

All the students started coughing and their eyes hurt. The teacher immediately opened the windows and ordered the students to leave the laboratory at once. She realized that the liquid was acrylamide (丙烯酰胺) and that it is poisonous.

Fortunately, nobody was injured in the incident. However, it taught the students and the teacher a good lesson.

1. The teacher and her students planned to make ________ in the experiment.
A.waterB.saltC.acrylamideD.carbon dioxide gas
2. How can they make the reaction quicker?
A.By putting more hydrochloric acid.B.By heating the hydrochloric acid.
C.By making the water cooler.D.By making the mixture hotter.
3. Why did Paul make the mistake?
A.There was only one bottle.B.His partner didn’t help him check it.
C.There was no label on the bottle.D.He didn’t pick the right one out of the bottles.
4. What happened when Paul heated the liquid?
A.His teacher ordered him to stop it at once.B.The white poisonous gas was formed.
C.All the students left the lab at once.D.Someone was injured in the accident.
5. What lesson did the incident teach the student and the teacher?
A.Never leave a bottle without a label in the chemistry lab.
B.Obey your teacher’s instructions in the chemistry lab.
C.Acrylamide can’t take the place of hydrochloric acid.
D.While something unusual happened, leave the lab at once.

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