某有机物的结构简式如图，它在一定条件下能发生下列哪些反应（ ）
①加成 ②水解 ③酯化 ④氧化 ⑤中和 ⑥消去
A．②③④
B．①③⑤⑥
C．①③④⑤
D．②③④⑤⑥
答案：C
题目分析：该有机物分子中含有苯环、醛基、羧基、醇羟基，故可发生加成反应，酯化反应，氧化反应，中和反应，但不能发生水解反应和消去反应（与羟基邻位碳原子上没有氢原子）。故选C。
| The conception of God and nature and of the relation of man to both provided the 18th- century philosophers with their faith in the worth and dignity of the individual man and the efficacy of human reason. The 18th century was the moment in history when men experienced the first flush and freshness of the idea that man is master of his own fate; the moment in history, also, when this emancipating idea, not yet brought to the harsh test of experience, could be accepted with unclouded optimism. Never had the nature seemed less mysterious, more simply constructed, more open and visible and eager to yield its secrets to common-sense questions. Never had the nature of man seemed less perverse, or the intelligence and will of men more pliable (yielding) to rational persuasion. Never had social and political evils seemed so wholly the result of ignorance and superstition, or so easily corrected by the spread of knowledge and the construction of social institutions on a rational plan. The first task of political science was to discover the natural rights of man, the second to devise the form of government best suited to secure them. And for accomplishing this high task, for creating and maintaining a society founded on justice and equality, the essential freedom was freedom of the mind. |
The "emancipating idea" in the last sentence of the first paragraph refers to the idea that ______ .
A．man is master of his own fate
B．men experienced the first idea
C．history is made up of moments
D．the first idea was flush and fresh