根据我国现行证券交易佣金收取标准的规定，A股每笔交易佣金最低收取()。
A. O元
B. 1元
C. 5元
D. 100元
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嘧啶环的第1位氮及第4、5、6位碳来自______，第2位碳和第3位氮来自______。
Which statement is true of the methane emissions of plants in the experiment？
A. The lower the temperature,the higher the amount of methane emissions
B. Living plants release less methane than dried plants at the same temperature
C. When exposed to sunlight, plants stop releasing methane
D. The higher the temperature,the greater the amount of methane emissions
52
A. simpler
B. more complex
C. more meaningless
D. more troublesome
体内脱氧核苷酸是由______直接还原生成，催化此反应的酶是______。
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