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【单选题】
Which of the following is NOT concerned with the elephants?A.
Elephants today are restricted to Africa and parts of Southeast Asia.
B.
They occupy a wide range of environments: marshes, forests, grasslands, mountains, and deserts.
C.
They also need a lot of drinking water and so are restricted to areas with inadequate water.
D.
They need great quantities of food to support their massive size.
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举一反三
【单选题】关于革兰阳性菌错误的叙述是 (1分)
A.
细胞壁的主要成分是肽聚糖
B.
肽聚糖层外有脂蛋白、外膜及脂多糖
C.
对青霉素敏感
D.
产芽孢的细菌都是革兰阳性细菌
E.
有些革兰阳性细菌能产生外毒素
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