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【多选题】
下列有关啮齿动物的表述，正确的是（）
A.
门齿很发达，无齿根，能终身生长
B.
种类多，数量大
C.
有犬齿，无齿虚位
D.
门齿前缘珐琅质，其余部分齿质
题目标签：啮齿动物
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【单选题】根据下面材料，回答题。 Eat More, Weigh Less, Live Longer Clever genetic detective work may have found out the reason why a near-starvation diet prolongs the life of many animals. Ronald Kahn at Harvard Medical S...
A.
offering them less food
B.
giving them a balanced diet
C.
disrupting the specific genes in their fat cells
D.
preventing them growing larger
【单选题】某雨林系统中有4种啮齿动物，其平均个体生物量分别是20、30、40和50克，试问在其它所有条件相同情况下，哪个物种的相对多度较高。（）
A.
生物量为20克的物种
B.
生物量为30克的物种
C.
生物量为40克的物种
D.
生物量为50克的物种
【单选题】Eat More, Weigh Less, Live Longer Clever genetic detective work may have found out the reason why a near starvation diet prolongs the life of many animals. Ronald Kahn at Harvard Medical School in Bos...
A.
humans, worms and rodents are different
B.
most people are not willing to be put on a strict diet
C.
the effect is not known
D.
genetic changes in tissues can not be performed on humans
相关题目：
【单选题】根据下面材料，回答题。 Eat More, Weigh Less, Live Longer Clever genetic detective work may have found out the reason why a near-starvation diet prolongs the life of many animals. Ronald Kahn at Harvard Medical S...
A.
offering them less food
B.
giving them a balanced diet
C.
disrupting the specific genes in their fat cells
D.
preventing them growing larger
【单选题】某雨林系统中有4种啮齿动物，其平均个体生物量分别是20、30、40和50克，试问在其它所有条件相同情况下，哪个物种的相对多度较高。（）
A.
生物量为20克的物种
B.
生物量为30克的物种
C.
生物量为40克的物种
D.
生物量为50克的物种
【单选题】Eat More, Weigh Less, Live Longer Clever genetic detective work may have found out the reason why a near starvation diet prolongs the life of many animals. Ronald Kahn at Harvard Medical School in Bos...
A.
humans, worms and rodents are different
B.
most people are not willing to be put on a strict diet
C.
the effect is not known
D.
genetic changes in tissues can not be performed on humans
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