题目问：it can be inferred from the last paragraph of the passage that which of the following must be true of the earth as it orbits the sun?
看了几遍还是没有看明白从哪里推测出来的:C:It crosses the Geminid meteor stream once every year.
212:the quotation in line 39 si most probably used to :
答案是A，我能理解它的正确性，但是为什么E不对呢？
谢谢回复！
Has the predicted twin-peaked activity been observed for the acutal yearly Geminid metero shower? 文中actual yearly已经表示是每年经过了。另外为什么The passage suggests that which of the following is a prediction concerning meteor streams that can be derived form both the conventional theories mentioned in line 18 and the new computer-derived theory?答案为什么是D: Meteor showers caused by older meteor streams should be , on average, longer in duration than those caused by very young meteor streams. OG的解释是说传统理论认为meteor streams随着时间推移涨大，但是line18不是说increasingly dense toward the center吗？我不懂啊！！！
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