小学生健康心理辅导以身心发育正常的小学生为对象，面向全体小学生，以全面提高其心理素质为目的、为重点。()

A. immigration is more a challenge than an opportunity.
B. immigration can be harnessed to serve the nation.
C. immigrants can hardly be assimilated into America.
D. the more immigrants America takes in, the better.

A. oil was first discovered and used in the Middle East.
B. the oil age is short-lived and has already come to its end.
C. the shortage of kerosene led to the use of petrol and diesel.
D. the oil age is largely attributed to technological developments.

A. the number of immigrants will exceed that of American natives by 2050.
B. immigrants will account for a large part of the population by 2050.
C. immigrants will populate the USA, including those remote communities.
D. the young immigrants will increase obesity and criminality in America.