题干

研究表明,某些植物在秋冬受低温袭击时,呼吸速率先升高后降低;持续的冷害使根生长迟缓,吸收能力下降,但细胞内可溶性糖的含量有明显的提高.下列推断不合理的是(  )

A:冷害初期呼吸作用增强,放出的热量有利于抵御寒冷

B:低温持续使淀粉合成酶活性减弱,影响可溶性糖合成淀粉

C:低温使细胞内结合水含量降低,自由水含量增加,以适应低温环境

D:低温使根细胞呼吸减弱,限制根细胞吸收矿质营养,导致吸收能力下降

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答案(点此获取答案解析)

C

同类题3

阅读下面短文,然后从各题所给的四个选项中选出一个最佳答案。

    My mom keeps asking what's going on at school, if I'm going to audition(试演)for a party, why I didn't try out for the female lead, what my friends are doing, and so on. It's 1 and sometimes it's like she doesn't trust me. How can I get her to 2?-Katie Many teenagers have the same 3 as Katie. They think it difficult to 4well with their parents. However, if you try another way, you can make a 5 . Parents seem to like6about your day. If you don't share or talk7with your parents, they might feel the need to ask you questions. It might seem that they're prying into(打听)your business, but they're probably just trying to keep your relationship8. In fact, parenting experts often9parents to form a good relationship with their kids by asking about what's going on in their lives. Some parents do this better than 10, of course.(And, unfortunately, some parents do ask questions because they don't trust their kids, especially if their kids have been in 11 .So start by trying to give your parents the benefit of the doubt. Maybe they're just trying to stay 12 because they love and care about you. That doesn't make the questions any less annoying, 13. If you're tired of so many questions about your day, 14 the tables – ask your parents questions and use it as a way to practice your good listening skills. 15 tell them about your day before they ask. If you offer more information, conversations with your parents won't have so many questions.