河流的集水区域称为（）。A.区域 B.集水面积 C.流域 D.水文分区

阅读下列短文，从每题所给的四个选项（A、B、C和D）中选出最佳选项，并在答题卡上将该项涂黑。

B

Grandparents Answer a Call

As a third generation native of Brownsville, Texas, Mildred Garza never pleased move away,. Even when her daughter and son asked her to move to San Antonio to help their children, she politely refused . Only after a year of friendly discussion did Ms Gaf finally say yes. That was four years ago. Today all three generations regard the move to a success,giving them a closer relationship than they would have had in separate cities.

No statistics show the number of grandparents like Garza who are moving closer to the children and grandchildren. Yet there is evidence suggesting that the trend is growing. Even President Obama’s mother-in-law, Marian Robinson, has agreed to leave Chicago and into the White House to help care for her granddaughters. According to a study grandparents com. 83 percent of the people said Mrs. Robinson ‘s decision will influence the grandparents in the American family. Two-thirds believe more families will follow the example of Obama’s family.

“in the 1960s we were all a little wild and couldn’t get away from home far enough fsst enough to prove we could do it on our own,”says Christine Crosby, publisher of grate manazine for grandparents .We now realize how important family is and how important”” to be near them, especially when you’re raining children.”

Moving is not for everyone. Almost every grandparent wants to be with his or her grandchildren and is willing to make sacrifices, but sometimes it is wiser to say no and visit frequently instead. Having your grandchildren far away is hard, especially knowing your adult child is struggling, but giving up the life you know may be harder.

What was the reaction of the public to Mrs. Robinson’s decision?（）

A．17% expressed their support for it.

B．Few people responded sympathetically.

C．83% believed it had a bad influence.

D．The majority thought it was a trend.

货币当局大量买进外汇时，将导致本币（）。

A.汇率上涨 

B.汇率下跌 

C.退出流通 

D.迅速回笼

陈某，男性，21岁，反复发作气急痰鸣10年余。半小时前因外出感寒后，又出现喉中痰鸣如吼，喘而气粗息涌，咳痰色黄，黏浊稠厚，排吐不利，口苦，口渴喜饮，汗出，身热，舌苔黄腻，质红，脉滑数。其诊断是（）

A.哮病发作期寒包热哮证

B.喘证表寒肺热证

C.哮病发作期热哮证

D.哮病发作期风痰哮证

E.喘证痰热郁肺证

以下哪一项CT表现，提示直肠癌失去手术机会（）

A.肿块外缘毛糙

B.直肠全周受累

C.直肠周围脂肪内肿大淋巴结

D.直肠周围筋膜增厚

E.直肠周围脂肪密度增高

简述产生环境误差的原因。