如图为人体免疫系统清除流感病毒(RNA病毒)的部分过程示意图.下列推测最准确的是( )
A:细胞乙的来源只有甲细胞,由甲细胞受到抗原刺激与淋巴因子作用分裂分化形成
B:与细胞丙相比,细胞乙的高尔基体和溶酶体都更发达
C:抗原——抗体被细胞丙胞吞后,消化得到的部分产物可被细胞利用
D:人体免疫系统清除流感病毒中,细胞甲、乙、丙都能进行增殖分化
由于转基因食品集合了优质的基因,因此可以放心食用.
夏天的梅雨季节,食品和衣服十分容易发霉和长毛,引起这种现象的原因是食品和衣服上长有( )
“Early to bed, early to rise(起身)makes people healthy, wealthy and wise(健康,富有,聪明).” This is an old English saying. Children should have ten hours' sleep every night, or they can't do their work very well. They will not be wise. The body needs exercise. Walking, running, swimming and playing ball games are all exercise. Exercise keeps the body strong.