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【单选题】
下图为生态系统中碳循环过程，其中甲、乙、丙、丁构成系统的生物群落，箭头表示物质循环方向。下列相关叙述正确的是 [ ]A.
图中②过程不一定需要氧气的参与
B.
该图也可以表示信息传递和能量流动
C.
类群丙的无氧呼吸是产生大气中气体X的途径之一
D.
增加图中甲的种类可使食物网变得更加复杂
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举一反三
【单选题】What is the only elements missing from a research proposal?
A.
the findings and your analysis of those results.
B.
the findings of the study and your analysis.
C.
the findings of the study and your analysis of those results.
D.
the findings.
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A.
cast iron
B.
forged steel
C.
stainless steel
D.
cast steel
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A.
①②③④⑤
B.
①②③④
C.
①②③⑤
D.
①②④⑤
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