我们在吃玉米果穗时,常会发现有缺粒现象,其原因是(   ) A.

我们在吃玉米果穗时,常会发现有缺粒现象,其原因是(  

A.缺乏水分             B.缺乏阳光             C.缺乏肥料            D.传粉不足

答案

D

相关题目

人体缺少维生素A会患        (   ) A.脚气病     
人体缺少维生素A会患        (   ) A.脚气病       B.夜盲症       C.佝偻病      D.坏血病
两个辍学的巨人           鲁先圣这几天,全世界因为
两个辍学的巨人           鲁先圣这几天,全世界因为一个人的去世而震惊和思考。他是全球计算机行业的领军人物、苹果公司创始人乔布斯。在
The traffic problems we are looking forward to seeing _______ should have attrac
The traffic problems we are looking forward to seeing _______ should have attracted the government's attention. A. solving                    B. solve                C.
下列物体属于光源的是 (     )       A.放电影时看到
下列物体属于光源的是 (     )       A.放电影时看到的银幕B.反射阳光的平面镜  C.月亮D.收看电视时看到的电视机屏幕   
—What do you think of the film The Flowers Of War directed by Zhang Yimou?
—What do you think of the film The Flowers Of War directed by Zhang Yimou? —_____.I can't think too highly of it.        A.It all depends                            
下列各组元素性质的递变错误的是(    )A.Li、Be、B原子最
下列各组元素性质的递变错误的是(    )A.Li、Be、B原子最外层电子数依次增多B.P、S、Cl元素的最高正化合价依次升高C.B、C、N、O、F原子半径依次增
Many teenagers feel that the most important people in their lives are their fri
Many teenagers feel that the most important people in their lives are their friends.They believe that their family members don’t know them as well as their friends do.In large families,it i
斯是陋室,________________。
斯是陋室,________________。

最新题目