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【单选题】
有关生长因子（细胞因子）和细胞分裂素的哪一些叙述是正确的？（） ①植物细胞分裂素是多肽 ②植物细胞团子是多肽 ③植物细胞分裂素是嘌呤衍生物 ④植物细胞因子是嘌呤衍生物 ⑤动物细胞分裂素是多肽 ⑥动物细胞因子是多肽 ⑦动物细胞分裂素是嘌呤衍生物 ⑧动物细胞因子是嘌呤衍生物A.
①和⑦
B.
②和⑧
C.
②和⑤
D.
③和⑥
E.
④和⑥
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举一反三
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【单选题】You are talking with a group of 4 people.With whom do you make eye contact?
A.
just the person to whom you are speaking at the moment
B.
each of the four, moving your eye contact from one to another
C.
no particular person
D.
all of the individuals you are talking with
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