A:standing on the platform was
B:was standing on a platform
C:on a platform was standing
D:was on a platform standing
在果蝇的下列细胞中,一定存在Y染色体的细胞是 ( )。
图1利用现代生物工程技术治疗遗传性糖尿病(基因缺陷导致胰岛B细胞不能正常合成胰岛素,也称为1型糖尿病)的过程设计图解.
阅读短文,判断正误。
Mr. Black has a bigfarm. There is a vegetable garden on the farm. You can see carrots, green beans, potatoes and tomatoes. On his farm, there are many animals, too. There are ducks, sheep, hens, horses and goats. Mr. Black likes his animals. He feels(感觉) happy. My friends and I often go to the farm and play with the animals. Some friends like horses and some like goats. I like sheep. We often help Mr. Black clean the farm.