题干

如下图所示,甲、乙分别用不透光的锡箔纸套在燕麦胚芽鞘的不同部位,丙、丁、戊、则分别用不透水的云母片插入燕麦胚芽鞘的不同部位,从不同方向照光,培养一段时间后,胚芽鞘的生长情况是 (   )

A:甲不生长也不弯曲、乙直立生长、丙向左生长、丁直立生长、戊向右生长

B:甲直立生长、乙向右生长、丙向左生长、丁不生长,也不弯曲、戊向左生长

C:甲向左生长、乙向右生长、丙直立生长、丁向右生长、戊向左生长

D:甲直立生长、乙向右生长、丙直立生长、丁不生长,也不弯曲、戊向右生长

上一题 下一题 0.0难度 选择题 更新时间:2019-07-31 10:43:41

答案(点此获取答案解析)

D

同类题3

语法填空

    China has developed a unique festival food culture throughout the years. Eating dumplings is a common folk custom for many Chinese on the day of winter solstice(冬至), especially those____live in the north.

    When midwinter comes, vital movement begins to decline and calm down. In this period,____eaten in a right amount, some nuts such as peanuts, walnuts, and chestnuts are good for one's body.

    People in Suzhou, Jiangsu Province,____ (be) accustomed to eating wontons in midwinter. According to an old story, during the midwinter feast 2, 500 years ago, the King of Wu____(feed) up with all kinds of costly foods and wanted to try____(variety) things. Then, the beauty Xishi made wontons to honor the kings wish. He ate a lot and liked the food very much. Later, the people of Suzhou had wontons to celebrate the festival____(official).

    In places such as Shanghai, people eat tangyuan, a kind of small dumpling ball____(produce)with sticky rice flour (粉). In Yinchuan, Ningxia, people call midwinter the "Ghost Festival". On that day, it is customary for people there to eat mutton soup and the dumplings in it. They give the midwinter soup a strange name and call it "brain", which they usually share with their____relative)

    People in Taiwan keep the custom of providing nine-layer cakes____their ancestors. People from the same family gather at their ancestral temples to adore their ancestors in order of their ages. After____(hold)the sacrificial ceremony, there is always a grand dinner.