偶见种(rare species)
[名词解释] 种(species)
[名词解释] 种(species):
[名词解释] 优势种(dominant species)
[名词解释] 建群种(constructive species)
[单选题]_____relatively rare ,serious confrontations between students do happenA.if onlyB.thoughC.whereasD.as if
[名词解释] 稀有元素(rare element)
[单选题]Thosegiftsofrarebooksthatweregiventousweredeeply_______.A)appreciatedB)approvedC)appealedD)applied
[单选题][A] small[B] few[C] rare[D] scarce
[单选题][A] scarce [B] little [C] rare [D] poor