This is a photo of my family . I'm John . I'm ten . My sister is seven . We are in the same school .My grandparents are Americans . My father is 42 .He is a driver . My mother is 40 . She is a teacher . We are very happy .
____ ____ you like to keep a cat?
社会不断进步,世界日益开放,面对不同的文化,我们应该( )①善于虚心学习其他文化的优点②采取客观、平等的态度③采取全盘肯定的态度④取其精华、弃其糟粕
组合
亲本表现型
F1的表现型和植株数目
紫花
白花
一
紫花×白花
403
410
二
白花×白花
0
798
三
紫花×紫花
1240
413