题干

下列关于植物细胞的结构和功能的叙述中,不正确的是(  )


A:细胞壁能维持细胞的正常形态

B:细胞膜能控制细胞内外物质的进出

C:液泡与细胞的吸水和失水有关

D:线粒体与植物的光合作用有关

上一题 下一题 0.0难度 选择题 更新时间:2019-08-13 08:37:28

答案(点此获取答案解析)

D

同类题4

阅读下列短文,从下面每小题的A、B、C、D四个选项中选出最佳选项。

    I'll tell you a secret. There's a place that gets me every time: whenever I'm there. I can't help but cry. Where is it? It's thousands of metres high in the sky, in a plane, especially when there's a heart-warming comedy on.

    Why am I admitting (承认) this now? Because I'm not alone. The British singer Ed Sheeran says he gets emotional (情绪激动的) when flying too. Also a survey carried out by Gatwick Airport in London found that 15% of men admit they're more likely (可能的) to cry during films in planes than watching at home. And 41% of men admit they often try to hide their tears in another survey by Virgin Atlantic (a British airline). In all, 55% of air travellers in the Virgin Atlantic study said they get emotional when flying. So, what's going on? A study from the Netherlands has shown that adults cry because of feelings of separation, loneliness or powerlessness. All of these are easily experienced when flying: you're far from family, often alone, and have no control over the flight.

    Another   ▲   is that when you're in a plane in the sky, there's not a lot you can do. So you are able to pay more attention to the movies you watch. Then there's the physical space. In a plane, air pressure and oxygen levels are lower, and this can affect (影响) our brain and emotions. On a flight, you may be leaving loved ones or really wanting to see them again, or you might have had a drink at a time you usually wouldn't, and if you see a scene that reflects your emotional state, without doubt it's easier for you to cry.