题干

把成熟的苹果和未成熟的香蕉密封在一起,可促使香蕉成熟,这是由于苹果释放出了

A:乙烯

B:脱落酸

C:芳香族化合物

D:赤霉素

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答案(点此获取答案解析)

A

同类题1

比较阅读。
(甲)曹刿论战
      十年春,齐师伐我。公将战。曹刿请见。其乡人曰:“肉食者谋之,又何间焉?”刿曰:“肉食者鄙,未能远谋。”乃入见。问:“何以战?”公曰:“衣食所安,弗敢专也,必以分人。”对曰:“小惠未徧,民弗从也。”公曰:“牺牲玉帛,弗敢加也,必以信。”对曰:“小信未孚,神弗福也。”公曰:“小大之狱,虽不能察,必以情。”对曰:“忠之属也。可以一战。战则请从。”
      公与之乘。战于长勺。公将鼓之。刿曰:“未可。”齐人三鼓。刿曰:“可矣。”齐师败绩。公将驰之。刿曰:“未可。”下视其辙,登轼而望之,曰:“可矣。”遂逐齐师。
      既克,公问其故。对曰:“夫战,勇气也。一鼓作气,再而衰,三而竭。彼竭我盈,故克之。夫大国,难测也,惧有伏焉。吾视其辙乱,望其旗靡,故逐之。”
(乙)齐欲伐魏
       齐欲伐魏,淳于髡谓齐王曰:“韩子卢者,天下之疾犬也;东郭逡者,海内之狡兔也。韩子卢逐东郭逡,环山者三,腾山者五。兔极于前,犬废于后;犬兔俱罢,各死其处。田父见之,无劳倦之苦,而擅其功。今齐魏久相持,以顿其兵,弊其众。臣恐强秦大楚承其后,有田父之功。”齐王惧,谢将休士也。
注释:①淳于髡(kūn):战国时齐国的上大夫.齐王:齐宣王,战国时齐国国君,姓田,名辟疆.②环山者三:相当于"三环山",意思是围绕着山追了三圈. 极:筋疲力尽地跑,废:精疲力竭地 追

同类题5

阅读下面短文,掌握其大意,然后从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。

    One of the most important lessons I learned from my father took place in our driveway when I was in elementary school. We used to play basketball every day, and he 1that I needed to learn how to shoot and dribble with my left hand. Being naturally athletic, I quickly became frustrated with my lack of left-handed 2. I became very angry, 3 down on the driveway, and began to cry, and my father stood there and looked at me as he waited 4 for me to get over my tears. When I realize that my behavior was not getting me 5, I got back up. He passed me the 6 and I continued to practice. His lesson of 7 giving up and working harder to accomplish my goals was conveyed to me without a word. I 8 became skillful with my left hand, but what I really learned that day was a road map for overcoming my biggest 9 in life.

    10 I was eighteen I was in a car accident, where I broke a vertebra in my spine. I was going to 11 to play soccer, and now I was told that I would never again be able to 12 athletically. For half a year I was not even able to 13 my own clothes. I wanted to 14 school and give up. I wanted to lie down and cry that life was 15, much as I had done in our driveway so long ago. 16every time I felt that way, that earlier memory danced in my mind. I knew that 17 I was patient and continued to work hard, I could overcome this difficulty.

    For three years I continued to go to school, doing three to four hours of 18 rehabilitation every day, with constant support from my parents. And I finally earned my 19 back on the playing field. That lesson in the driveway had 20 me to be on the field, and I owed it all to my dad. I succeeded because of who my father is, and who I am because of him.