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【多选题】
导游服务的三要素是()A.
语言
B.
知识
C.
技能
D.
道德
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【判断题】In species in which females are the homogametic sex, gender of offspring is determined by the male.
A.
正确
B.
错误
【单选题】In which of the following groups is the discovery of new species not mentioned in the passage?
A.
Birds.
B.
Monkeys.
C.
Trees.
D.
Freshwater fish.
【单选题】In which of the flollowing groups is the discovery of new species not mentioned in the passage?
A.
Birds
B.
Monkeys
C.
Trees.
D.
Freshwater fish.
【单选题】In terms of species, which of the following biologist holds that species are immutable ?
A.
Carl von Linné
B.
Jean-Baptiste Lamarck
C.
Charles Robert Darwin
D.
Theodosius Grygorovych Dobzhansky
【简答题】革兰氏阳性菌细胞壁的主要成分为______和______，而革兰氏阴性菌细胞壁的主要成分则是______、______、______和______。
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