【名词&注释】
主动脉(aorta)、大气压(atmospheric pressure)、深吸气(deep inspiration)
[单选题]关于静脉血压的叙述，下列选项错误的是 （ ）
A. 站立时颅内静脉窦的压力低于大气压
B. 中心静脉压的高低与心脏的射血能力有关
C. 深吸气时中心静脉压升高
D. 正常成人在立正状态下，足背静脉压和主动脉平均压几乎相等
E. 足背静脉压在行走时比立正时低
查看答案&解析
举一反三：
[单选题]Passage TwoThe earliest immigrants to North America found Indians already living there. The Indians numbered about 500,000 at that time. Their society was a primitive society, but they lived peacefully and welcomed the white strangers to the land. However, these early immigrants from Europe didn't want to share the land with the natives. They killed off many of the Indians, seized their land or pushed them off to lands farther away. Today the Indians, not more than halfa million, live in poverty and misery on the land on which they were once masters.
A. The earliest immigrants were the Spanish, who settled in the southern part of what is now the US The next large group were the English, after the English came the French, Dutch, Irish, Germans, and other nationality groups, mostly European.
B. Another early group to arrive were the Negroes. But they were brought in as slaves from Africa. They didn't win freedom till generations later.
C. 40. Who were the earliest people living in North America?
D. The Spanish.
E. The English.
F. The Negroes.
G. The Indians.
[单选题]All ______ is an adequate supply to meet the demand.
A. needed
B. the things needed
C. that needed
D. what is needed
[单选题]It is a process during ______ the body releases water to cool the skin.
A. when
B. which
C. where
D. that
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