客舱空气污染是一个重要问题。 A: Contamination of cabin air can be an important problem. B: Contamination of cabin air can be a considerable problem. C: Contamination of cabin air can be a fundamental problem. D: Contamination of cabin air has priority.

mercury/ ‘mə:kjuri/ A: vt.使混乱,混淆 B: n.最小量 a.最小的 C: a.有节制的;谦虚的 D: n.水银,汞

Mercury is a metal pollutant that can disrupt the ecosystem. Why is mercury so disruptive to the ecosystem? A: Organisms excrete the mercury out as waste. B: Organisms use mercury as an enzyme to speed up reactions in an organism's body. C: Mercury slows down the respiration rates of primary consumers. D: Mercury can become concentrated in the tissues of organisms.

Inject a little mercury (Hg) into a horizontal glass capillary tube. The two ends of the horizontal mercury column are convex. If heating the right convex of mercury, the mercury in the capillary will move ( ). A: to the left B: to the right C: to both ends D: no

将水银抹在铂金上，铂金将会受污染。