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【多选题】
下图为人体内两种重要化合物A与B的化学组成关系，相关叙述中不正确的是 [ ]A.
a的种类约有20种，b的种类有8种
B.
a的结构通式可表示为
C.
B是人的遗传物质
D.
A的种类在神经细胞与表皮细胞中相同，B则不同
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A.
This is Mrs Davis. She is in charge of exports.
B.
Hi! How are you?
C.
Good morning. Pleased to meet you.
D.
Nice to meet you at last!
E.
Good to see you again!
F.
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【单选题】人造纤维与合成纤维的区别在于 [ ]
A.
人造纤维的原料是天然纤维，合成纤维的原料是石油、天然气等
B.
人造纤维的原料是石油、天然气等，合成纤维的原料是天然纤维
C.
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D.
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