The main idea of the second paragraph is______.
A. diversity of the workforce has its disadvantages
B. besides new opportunities, the changing workforce also contain challenges
C. the low educational levels of immigrants is a challenging problem
D. America had better face the problem of declining skills or it will suffer
One characteristic of the new workforce is______.
A. the low educational level of it compared to previous years
B. the large share of Mexican immigrants
C. the low educational level of its immigrants
D. a gap between educational levels in certain immigrants
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