题干

某研究性学习小组探究营养液中O2含量变化对某植物吸收K+速率的影响(其他条件都是适宜的),实验结果如图.下列有关说法错误的是(  )

A:可分析得出该植物吸收K+是要消耗能量的

B:从图中可以看出该植物必须在有氧条件下才能吸收K+

C:ab段限制K+吸收速率的主要因素是O2浓度

D:bc段表示除了营养液中O2含量,还有其他因素影响K+的吸收速率

上一题 下一题 0.0难度 选择题 更新时间:2015-12-14 07:33:31

答案(点此获取答案解析)

B

同类题2

根据短文内容, 从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    Although many Chinese students say their knowledge of English grammar is good, most would admit that their spoken English is poor. ____ However, their spoken English does not have to remain poor. I would suggest that there may be some reasons for their problems with spoken English.

    First, ____ Obviously the better answer is to expand their vocabulary. However, you can speak, with a limited vocabulary if your attitude is positive. Others will follow you as long as you use the words that you know.

    Second, ____. Sometimes they make mistakes when they are speaking because they are shy and nervous. Yet students should remember that their goal should be FLUENCY NOT ACCURACY. You want to get your message across, to talk to someone in English, as quickly and as well as you can, even though sometimes you may use a wrong word or tense, but it doesn't matter because the person you are speaking to will understand you and make allowance for any mistakes he hears.

    Third, ____.You have one mouth but two ears! All that hearing is necessary for you to start speaking.

    Fourth, ____. Instead of actively seeking out opportunities to improve their spoken English, they passively wait for speaking opportunities to come to them and wonder why their spoken English always remains poor. If you have this proactive outlook,then you will see English opportunities wherever you go.

A. not enough attention is paid to listening.

B. they fail to find suitable words to express themselves because of limited vocabulary.

C. most Chinese students are not active language learners.

D. They are so stupid that they cannot finish their necessary homework in time.

E. Whenever I speak to Chinese students they always say, “My spoken English is poor.”

F. it is no use crying over spilt milk.

G. they are afraid of making mistake.