题干

如图是某生物兴趣小组探究不同条件下光合作用和呼吸作用过程中气体产生情况的实验示意图,装置中的碳酸氢钠溶液可维持瓶内的二氧化碳浓度在恒定水平.下列几种实验结果(给予相同的环境条件),你觉得不可能出现的是(  )

A:甲、乙装置水滴都左移

B:甲、乙装置水滴都右移

C:甲装置水滴不动,乙装置水滴左移

D:甲装置水滴右移,乙装置水滴左移

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答案(点此获取答案解析)

B

同类题3

请认真阅读下面短文,从短文后各题所给的A、B、C、D四个选项中。

    On a recent sunny, dry fall morning, I found the last outdoor table at my favorite café. Reading 1 I nibbled my breakfast, I was enjoying the feeling of the cool breeze and the warm sun when a table next to me 2. A woman who had been standing nearby, 3 waiting for a seat, stepped toward the table. But from the other 4, straight from the parking lot, came a man who got to the table first.

    The woman, with a 5 on her face, explained that she'd been 6 that table for several minutes and had been on her way over. The man, also smiling but 7, told her she was out of 8; he had happened upon the table first. "You snooze, you lose!" he said cheerfully.

    She stood off to the side, clearly disappointed, and 9 her friend with the frustrating news. I sat at my table, 10 the scene, when suddenly it occurred to me—I had a(n) 11 here to be kind.

    I stood up and 12 her over to my table. Quietly, I told her I had seen what had happened, and I was happy to give her my table. I was only going to be there a few more minutes 13, so I was happy for her and her friend to have the 14.

    "But where will you sit?" she asked. I was almost done eating, I said, and I would find a seat at the counter 15. She thanked me and beamed as she 16 for her friend to sit down.

    Thinking about it as I finished up, I realized that whether or not the woman had fair 17 to the table was unimportant. The emotion of the situation—the look of hurt on her face—had 18 me, and I had the ability to do something about it.

    That isn't always the case with every feeling, situation, or injustice we 19 unexpectedly in our days. But as the early 20th century writer Orison Swett Marden once said, "Don't wait for extraordinary opportunities. 20 common occasions and make them great."

    I just hope that woman's morning at the café was great. I know mine was.