题干

某植物种子成熟后需经低温贮藏才能萌发,为探究其原因,检测了该种子中的两种植物激素在低温贮藏过程中的含全变化,结果如图。根据激素的作用特点,推测图中a, b依次为(    )

 

A:赤霉素、脱落酸

B:细胞分裂素、生长素

C:赤霉素、乙烯

D:脱落酸、细胞分裂素

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答案(点此获取答案解析)

A

同类题3

阅读表达 阅读下面的短文并用英语回答问题,并将答案写在答题卡上标有题号的横线上。

    The way we spend our time can be. divided into three groups,or jars(罐子).These would be the necessary tasks jar, the voluntary tasks jar and the happiness jar.

    Every day,we spend time filling the necessary tasks jar. We fill this jar with useful things,like making money,doing housework,buying food and paying bills. We then fill another jar with voluntary tasks like taking children to activities and cooking family meals. Those jars are very important,but we may not enjoy them. If we don't fill them each day,our family won't run properly.

    However, we often forget to fill the third jar—the happiness jar. This is the jar that we fill with activities that make us happy. Is your happiness jar sometimes empty at the end of the day? We all have days like that. Between doing all the necessary, and voluntary tasks,time flies by on some days,and before we know it,it is time for bed.

    That is why each day we try to fill our happiness jar. Most days,I fill mine by going to the ballroom dance(社交舞)class. Playing music is another way that I fill my happiness jar. This week,I was happy to take part in an orchestra(管弦乐队)practice at my church(教堂).At the end of the evening, my happiness jar was full.

    Consider how your time is spent. Try to find ways to achieve a balance. At the end of the day,hopefully we've done all we can to make sure that our happiness jar is filled.