九年级新目标英语周报2019－202237期答案

12.【答案】D【解析】在植物的生长发育和适应环境变化的过程中,各种激素的含量会发生不同的变化,由图也明显地看出,不同的发育时期各种激素的含量不同,D错误;吸水是种子萌发的第一步,种子只有吸收一定水后,才可以开始其它的生理活动,大雨天气给在穗上的种子提供了萌发所需要的水分,种子就更容易萌发,A正确;一般来说,植物激素对植物生长发育的调控,是通过调控细胞分裂、细胞伸长、细胞分化和细胞死亡等方式实现的,B正确;由左图可知,种子发育后期脱落酸含量增加,种子含水量下降,说明脱落酸能促进种子脱水干燥,有利于种子的休眠;由右图可知,种子萌发过程中生长抑制剂脱落酸的含量下降,赤霉素含量上升,故干热高温降解脱落酸,利于种子萌发,C正确。

短文改错We had a wonderful party tonight at the school hall. It not only was meant to welcome the freshmen, and also allowedthem to meet senior students in a relaxing and happily environment. At the first, our headmaster gave a speech. He saidappyhich the party was a really great way A strengthen the friendship between students and teachers. Actually, the partythat/whichalso provided students for a good chance to showSome of my classmates, who was responsible for thwiththemselveswerearranged for singing, dancing and other entertaining activity. The party ended with the song Young Heart, which inspiredactivitiesboth the senior students and the new ones. How a great party it was IWhat

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