【正确答案】 B

【答案解析】[听力原文]21-25 There is probably nothing more mysterious and wonderful-looking in the sky than the Milky Way, stretching like a band of jewels from one end of the sky to the other. Long, long ago, when people gazed at this sight, they were filled with wonder just as you are today. But since they didn't know what it was, they made up all sorts of strange and beautiful conjectures of the Milky Way. For example, in early Christian times, people thought it was a way along which the servants of God went up to heaven. Some imagined it was an opening in the heaven, so that we here on earth could have a glance of the magnificent inside. Knowing the facts about the Milky Way, as we do today, doesn't take away any of the wonder of it. The facts are just as amazing as any "made-up" idea! Our galaxy is roughly like a watch, round and flat. If you could get above it and look down on it, it would look like a very large watch. But we are inside the galaxy, and when we look up we are looking towards the edge from inside the "watch". So we' see that edge around us. And since there are millions of stars in it, they appear to us as the Milky Way. Do you know that there are at least 3,000,000,000 stars in the galaxy? And here is an idea of its size. It takes eight minutes for light from the sun to reach the earth. For light from the middle point of the galaxy to reach the sun, it takes about 27,000 years! The galaxy turns about its center like a wheel. From our position in it, it takes about 200,000,000 years just to make one round. [分析] 因果关系的找寻和判断。 根据原文But since they didn't know what it was，they made up all sorts of strange and beautiful conjectures of the Milky Way可知由于当时人们不知道银河是由什么构成的，他们便给银河编造了各式各样瑰丽奇妙的故事。由此可见，选项B的说法与原文意思相符，因此该项为正确答案。 [解题关键] 1)根据表原因的信号词since判断答案信息处；2)掌握同义词替换。本题原文中conjectures(猜测)与选项B中imagined意思相同。

【正确答案】 B

【答案解析】[分析] 特定信息的找寻和判断。 根据题干中关键词In early Christian times定位到原文相关信息Some imagined it was an opening in the heaven，so that we here on earth could have a glance of the magnificent inside即当时人们以为银河是天堂的开口，这样地上的人们便可有机会瞥一眼天堂里壮观的景象，由此可见B项内容与原文意思相符，该项为正确答案。 [解题关键] 掌握同义词替换。文中have a glance与选项B中have a look同义。

【正确答案】 A

【答案解析】[分析] 事实细节的找寻和判断。 根据原文Our galaxy is roughly like a watch，round and flat．If you could get above it and look down on it，it would look like a very large watch可知我们的星系大致像块表，又圆又平。如果你从星系上方向下看，它就像一只巨大的表。由此可见A项内容与原文相符，该项为正确答案。 [解题关键] 根据选项方位特点正确定位原文相关信息。

【正确答案】 C

【答案解析】[分析] 事实细节的找寻和判断。 根据原文For light from the middle point of the galaxy to reach the sun，it takes about 27，000 years可知从星系中点到太阳，光要走上两万七千年。由此可见C项内容与原文相符，该项为正确答案。 [解题关键] 根据题干数字迅速定位原文相关信息。

【正确答案】 D

【答案解析】[分析] 事实细节的找寻和判断。 根据原文The galaxy turns about its center like a wheel可知星系围绕中心转，就像车轮。 由此可见D项内容与原文相符，该项为正确答案。 [解题关键] 掌握同义词替换。文中turns about its center与选项D中turns around the middle point意思相同。