单项选择题

After the concert, the clean-up crew found the ground（）with papers, bottles and cans.

A. scrubbed
B. used
C. littered
D. dispersed

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单项选择题

The new policy has（）a large amount of investment for industry and business in this city.

A. acquainted
B. adhered
C. activated
D. asserted

单项选择题

Interferon is produced by（）。

A. infecting viruses, bacteria, and tumors with a drug
B. infecting proteins with a virus
C. infecting white blood cells with a virus
D. infecting viruses with proteins