题目选项分析

Laos has a land area comparable to that of Great Britain but a population of only four million people, many of whom are members of hill tribes ensconced in the virtually inaccessible mountain valleys of the north.

Laos has a land area of about the same size as Great Britain is, but in Laos there is a population of only four million, and many are members of hill tribes ensconced in the virtually inaccessible mountain valleys of the north.