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问题 选择题

陈先初先生在《五四时期民主观念的演变路径》中提到“在新文化运动向前推进的同时，国内外发生了一系列影响深远的重大事件，改变了中国近代历史的走势……民主观念又开始了新的转变”这里“新的转变”指

A．实践英国自由主义民主

B．效仿法国激进主义民主

C．实行德国保守主义民主

D．追求俄国苏维埃式民主

答案

答案：D

题目分析：新文化运动后期以宣传马克思主义为主，“以俄为师”，根据材料“新文化运动向前推进的同时...民主观念又开始了新的转变”正说明了当时的思想界对苏俄民主的推崇。

单项选择题

品质优良的青贮饲料PH值应为（）

A.5.7—7

B.3.8—4.2

C.2.5—4.5

D.3.8—5.2
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单项选择题

The great advance (91) rocket theory 40 years ago showed that liquid-fuel rockets were far (92) in every respect to the skyrocket with its weak solid fuel, the only kind of rocket then known. (93) , during the last decade, large solid-fuel rockets with (94) fuels about as powerful as liquid fuels have (95) their appearance, and it is a favorite layperson’s question to (96) which one is "better". The question is meaningless. (97) might as well ask whether a gasoline or a diesel engine is "better". It all (98) on the purpose. A liquid-fuel rocket is complicated, (99) has the advantage that it can be controlled beautifully. The burning of the rocket engine can be stopped completely; it can be reignited when (100) . (101) , the thrust can be made to vary by adjusting the speed of the fuel pumps. A solid-fuel rocket, on the other hand, is rather (102) in construction, (103) hard to build when a really (104) size is desired. But once you have a solid-fuel rocket, it is ready for action (105) very short notice. A liquid-fuel rocket has to be fueled first and cannot be (106) readiness for very long after it has been fueled. (107) , once a solid-fuel rocket has been ignited, it will keep burning. It cannot be stopped and reignited (108) desired (it could conceivably be stopped and reignited after a pre-calculated time of burning has elapsed, and its thrust cannot be varied. Because a solid-fuel rocket can be kept ready for a long time, most military missiles (109) solid fuels, but human-piloted spaceflight needs the fine adjustments that can (110) be provided by liquid fuels.

A．However

B．Therefore

C．But

D．On the contrary
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