正确答案: A

气候顶极

题目：单元顶极学说中的“顶极”是指( )

解析：A

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举一反三的答案和解析：

[单选题]

supperB． suppose

[单选题]关于迷走神经的行程，下列描述错误的是 （ ）

只在食管前部下行

[单选题]书法艺术产生于。（ ）

中国

[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.

The Indians.

解析：参见本文第一句。