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【单选题】
下列关于生命活动的调节叙述正确的是 [     ]
A.
生长素可以加快新陈代谢，因而生长素是种高效的酶
B.
生长素总是从高处向低处运输
C.
CO 2 可以有效刺激呼吸中枢，从而使呼吸加深加快，因而CO 2 也可以调节生命活动，属于体液调节
D.
胰岛素和胰高血糖素共同调节血糖，让血糖浓度稳定在一定范围内，因而胰岛素和胰高血糖素之间表现为协同作用
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【简答题】Complete the following sentence by filling in each blank with an appropriate word. Change the form where necessary. for good; avid; help sb. out; spill over; check on; run into; confirmation; make cer...
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