单项选择题

The Untied States and Canada are lands of（）except for the Indians, who are the only tree natives

A. emigrants
B. immigrants
C. dwellers
D. inhabitants

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单项选择题

Many states plan to modify their prepaid college tuition programs（）

A. under the mounting financial pressures
B. because of deficient college facilities
C. to ease overcrowding problems in college
D. to limit the participation of low-income families

单项选择题

The once separate issue of environment and development are now______linked.

A. intangible
B. indispensable
C. inextricably
D. incredibly