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The 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 half a million,live in poverty and misery on the land on which they were once masters.
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.
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.

Why didn't the immigrants share the lands with the natives?

A.They thought the Indians were not friendly to the
B.They wanted to seize the lands as their ow
C.Because North America was first discovered by the
D.Because the Indian people liked making war to the

射精管开口于 （　　）

A.膀胱底的两侧

B.膀胱颈的下端

C.尿道膜部

D.尿道前列腺部

E.尿道海绵体部

判断休克的依据，哪项是错误的（　　）

A.精神状态：反映脑灌流情况

B.肢体温度，色泽：反映体表灌流情况

C.脉搏与脉压：收缩压低于12．0kPa(90mmHg)，脉压小于4/0kPa(30mmHg)

D.尿量低予40mL/h，可诊断早期休克

E.中心静脉压：正常值为0.59～1.18kPa(6～12cmH2O)