题目内容

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A. To discuss the results of the lab experiment.
B. To answer the students' questions about the lab experiment.
C. To explain the method of collection by water displacement.
D. To prepare the students to do the lab experiment.

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A. Magnesium.
B. Limestone.
Carbon.
D. Water.

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A. The hydrochloric acid broke the carbon bonds in the carbon dioxide.
B. The magnesium oxide broke the carbon-oxygen bonds in the carbon dioxide.
C. The burning magnesium broke the carbon-oxygen bonds in the carbon dioxide.
D. The gas collection method broke the carbon-oxygen bonds in the carbon dioxide.

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A. In the lab.
B. In the classroom.
C. In the hallway.
D. In Professor Smith's office.

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A. Bob does not get along with his lab partner.
B. The students performed the experiment correctly.
C. The students had problems, and could not complete the lab experiment.
D. There was a fire in the lab during the experiment.

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A. To discuss the results of the lab experiment. B. To answer the students' questions about the lab experiment. C. To explain the method of collection by water displacement. D. To prepare the students to do the lab experiment.

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A. To discuss the results of the lab experiment.
B. To answer the students' questions about the lab experiment.
C. To explain the method of collection by water displacement.
D. To prepare the students to do the lab experiment.