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【单选题】
柴油发动机在单缸断火试验时，响声无明显变化，相邻两缸断火时响声会有明显减弱时，是( )。A.
活塞销响
B.
活塞敲缸声
C.
连杆轴承敲击声
D.
曲轴轴承敲击声
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【单选题】听力原文： Many egg-laying animals merely lay their eggs and leave. Turtles for instance, leave their eggs to hatch on their own. The current theory about birds is that the earliest birds did just that whe...
A.
Their flying ability improved greatly.
B.
They became warm-blooded.
C.
They began to lay eggs.
D.
They changed their migration patterns.
【单选题】听力原文： Many egglaying animals merely lay their eggs and leave. With turtles for instance, the eggs hatch on their own. The current theory about birds is that the earliest birds did just that, when they...
A.
How birds' nests have evolved.
B.
Why some birds' nests am considered primitive.
C.
How birds learn to build nests.
D.
Why birds lay eggs.
【单选题】Section B Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You shoul...
A.
human activities have changed the way turtles survive
B.
efforts have been made to protect turtles from dying out
C.
government bureaucracy has contributed to turtles' extinction
D.
marine biologists are looking for the secret of turtles' reproduction
【单选题】米格－25效应是指，事物的内部结构是否合理，与其整体功能的发挥关系很大。在一定条件下，整体能力大于个体能力之和。 下列不能体现米格－25效应的是（ ）。
A.
金刚石和石墨均由碳原子构成，但因为原子的空间排列不同，前者比后者坚硬得多
B.
三个臭皮匠赛过诸葛亮
C.
田忌与齐威王赛马，因调整三匹马的出赛顺序，稳操胜券
D.
众人拾柴火焰高
【单选题】听力原文： Many egg-laying animals merely lay their eggs and leave. Turtles, for instance, and horseshoe crabs, the eggs hatched and the little ones are their own. The current theory about birds is the ear...
A.
Their flying ability improved greatly.
B.
They became warm-blooded.
C.
They began to lay eggs.
D.
They changed their migration patterns.
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