[单选题]月经周期缩短，月经频发，习惯性流产，可能是()
A.经量过多
B.黄体功能不足
C.子宫内膜不规则脫落
D.子宫不规则出血
E.月经过多

[听力原文]11-15
Men are the cleverest and most dangerous animals on earth. Rats come second. Men kill their enemies. They have killed millions of men since ancient times-but rats have killed hundreds of millions of men. Rats carry diseases. Black rats carry a fatal disease called plague which still kills thousands of Asians and Africans today—as it killed millions of Europeans in the past, until brown rats came to Europe and pushed black rats out. There is no plague in Europe today, but brown rats carry 35 other diseases. Rats are dangerous. They not only carry diseases into men’s homes, they also take men’s food. They eat 33 million tons of grain every year. That is enough grain to feed’ 200 million people—so men die of hunger because rats eat their food. Rats are clever, too. They have good leaders. Men try to poison them, but if their leaders tell them that food is dangerous they do not eat it. So our cities and villages are full of rats. We c

Many older Americans spend their final years in a nursing home or assisted living center. These places provide services that help older adults with activities they can no longer do on their own. However, most people say they would like to remain in their own homes. Now, there are nonprofit groups that help them do that.
Philip Smith is ninety-one years old and lives with his wife in an old house in Seattle, Washington. And he wants to keep it that way. He always says: "As far as I’m concerned, I would not like to leave this place. Living in a group situation is something I couldn’t tolerate. I’d kill myself before I had to do that."
Mr. Smith says now he and his wife can take good care of themselves in their two-level house. But he and his wife know they will soon need help with simple housework. Work like changing a light bulb that hangs at the top of the stairs. In the past, an older American would ask one of their children or a neigh
A. nowadays children wouldn’t like to help their parents
B. their children are married and busy all the time
C. their children have grown up and long gone
D. traditionally, children have no responsibility to help their parents