月经的发生与下列哪种因素有关（　　）

【名词&注释】

人绒毛膜促性腺激素(human chorionic gonadotropin)、拉丁语(latin)、卵泡刺激素(follicle stimulating hormone)、两封信(two letters)、黄体生成素水平(luteinizing hormone level)、雌二醇水平(estradiol concentration)、希腊语(greek)、孕酮和雌二醇(progesterone and estradiol)

[单选题]月经的发生与下列哪种因素有关（　　）

A. 血液中前列腺素的浓度降低
B. 血液中孕酮和雌二醇^{(progesterone and estradiol)}水平^{(estradiol concentration)}下降
C. 血液中孕酮水平升高，雌二醇水平^{(estradiol concentration)}下降
D. 卵泡刺激素和黄体生成素水平升高
E. 血中人绒毛膜促性腺激素浓度升高

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学习资料：

[单选题]What can we conclude from this passage?

回答下面的题目Two hundred years ago, American students went to American schools． Like you, they studied arithmetic, spelling and geography． Unlike you, they also studied Greek and Latin． In fact, students spent more than half their time studying Greek and Latin．The same was true for most students in Europe． Until the seventh century, all educated Europeans knew Latin． It did not matter if they lived in England or Italy or France or Spain． If they were educated, they knew Latin．During the seventh century, educated Europeans began to study Greek as well as Latin． Greek and Latin had been the leading languages of the ancient Greeks and Romans． All educated Europeans were expected to know these languages．To educated Europeans, the languages of the Greeks and the Romans were important． The ideas of the Greeks and Romans were also important． People knew that many of their own ideas had come from the Greeks and the Romans． To understand their own culture, they must understand its origin． They knew that those beginnings lay in the classical world．Today we have so many things to study that few people have time to learn Greek and Latin． Few of you will study either language in school． Yet the ideas of the Greeks and the Romans are still important to us． These ideas still help to shape Western culture today． To understand our own culture, we must understand the culture of the classical world．A good synonym for "origin" is________

A. Greeks and Romans significantly influenced European culture．
B. The Greeks were the founders of democracy．
C. The Greeks and Romans were bitter enemies．
D. People of the classical world were barbaric and uneducated．

[单选题]Grammarbooks here _______ well．

A. are sold
B. sell
C. sells
D. have beensold

[单选题]__________the PLA men the villagers would not have survived the flood．

A. It had notBeen for
B. Had it notBeen for
C. Were it not for
D. Has it notBeen for（　　）

[单选题]

[单选题]两封信随机地投入标号为1，2，3，4的4个邮筒，则1，2号邮筒各有一封信的概率．等于

A. 1/16
B. 1/12
C. 1/8
D. 1/4

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