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【单选题】
Paragraph 3: Question What does the author imply when he says “... he did not smile until I asked him what he was doing”?A.
The implication is that ordinary people truly believed in what he was doing and performed the whole thing seriously.
B.
The implication is that the learned professor didn't believe in what he was doing and performed the whole thing seriously.
C.
The implication is that the learned professor truly believed in what he was doing and performed the whole thing seriously.
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【简答题】下列说法正确是（ ）。
【简答题】将等量萌发的种子和煮沸自然冷却后的种子分别放入甲、乙两个试管中，如下图所示本实验中石蜡油短期内不影响生物的生长）。两试管中均无空气存在。据图分析回答： （1）甲试管放置几个小时后，管内顶部出现气泡，其中的气体成分主要是________；将该气体引入________溶液中，可使该溶液变混浊。 （2）甲试管中产生气泡的现象是种子进行________________造成的，写出表示这一过程的反应式___...