下表是洛阳和M地同一天中的天空状况观测记录，据此回答下列各题。
与晨光和昏影的出现密切相关的大气过程是（）
A.大气对地面的保温作用
B.大气对太阳辐射的散射作用
C.大气对太阳辐射的反射作用
D.大气对太阳辐射的吸收作用
参考答案：B
解析：
因大气对太阳辐射的散射作用，使得太阳未出地平线，已现晨光，太阳已落地平线，仍留昏影，实际昼长时间长于理论上的昼长时间。B项正确。
考点：地球运动；大气的热力作用。
"Where is the university(大学)?"This is a question that many visitors to Cambridge(剑桥)ask. But no one can give them a 36 answer, for there is no wall to be found 37 the university. The university is the city. You can find classroom buildings, 38 , museums and offices of the university all over the city. And most of its members are the students and 39 of the thirty-one colleges (学院). . Cambridge was already a 40 town long before the first students and teachers arrived 800 years ago. It grew up by the river Granta, and the river was once 41 the Cam. A 42 was built over the river as early as 875. So the town got its name "Cambridge". In the fourteenth and fifteenth centuries more and more land was used for college buildings. The town grew much 43 in the nineteenth century after the opening of the railway in 1845. Cambridge became a 44 in 1951 and now it has a population of over 100, 000. Many young students in other countries 45 to study at Cambridge. Thousands of people from all over the world come to visit the university town. It has become a famous place all around the world.
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