题目内容

______

A. Corn and sugar cane.
B. Rye and corn.
C. Strong beer and wheat.
D. Rice and wheat.

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______

A. The number of them decreases dramatically.
B. They mainly move from south states.
C. They come to Chicago without work visa.
D. The number of them increases after the recession.

______

A. The law of immigrants.
B. The environment for companies.
C. The number of work visas.
D. Higher salary and better titles.

______

A. Growing population.
B. Packaging materials.
Changed eating habits.
D. Lower production cost.

______

A. By saving energy.
By using less aluminum.
C. By reducing poisonous wastes.
D. By making the most of materials.

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