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【单选题】
Choose the best answer. Is Ken your friend?A.
No, it isn't.
B.
Yes, they are.
C.
No, I'm not.
D.
No, he isn't.
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举一反三
【简答题】How damaging was the storm?It caused four deaths and serious damage including a ______.
【简答题】A few days ago, I bought some ink for my printer at my favorite $1 Supermarket, which sold everything from fresh produce to birthday cards at one dollar. Then l found a better at a computer store. So ...
【简答题】7 I bought/sold my old car and
got a new one. ____
【单选题】以下关于胚胎的早期培养和动物体细胞培养的说法错误的是 [ ]
A.
胚胎的培养液中，除一些无机盐和有机盐类外，还需添加维生素、激素、氨基酸、核苷酸等营养成分，以及血清等物质
B.
培养细胞的增殖方式均为有丝分裂
C.
培养过程中都要进行细胞分化
D.
都需要适宜的温度和pH
【简答题】All the scientific evidence ________ that increasing use of chemicals in farming ________ damaging our health. [ ] A . show; are B. shows; are C. show; is D. shows; is
【多选题】B族维生素除胆碱以外,其它的均以辅酶的成分参与物质代谢。VB1的特点是
A.
VB1营养缺乏雏鸡患多发性神经炎，其它动物出现碳水化合物及脂肪代谢受阻，胃肠功能紊乱，影响神经心脏正常功能，严重可死亡。
B.
牛采食过量蕨类植物（问荆、木贼含硫胺素酶）可导致VB1缺乏
C.
犬、猫喂生鱼易缺VB1
D.
常用添加剂硫胺素盐酸盐补充或天然饲料酵母糠麸补充
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