A. The number of the Chinese students studying in the US
B. The Chinese government's reaction to this affair
C. The time when the US delegation will leave Beijing
D. The increase of the US students that study in China
A. a story book
B. a newspaper
C. a literary magazine
D. a textbook
A. Consumers waste "virgin fibers" because they lack knowledge
B. Consumers don't waste "virgin fibers" without knowledge
C. Consumers stopped using "virgin fibers" as waste because of knowledge
D. Consumers waste "virgin fibers" without know it
A. recycled tissue products are usually of bad quality
B. few consumers want to buy recycled-toilet paper
C. in Europe west forests are used to product household paper
D. consumers don't like non-recycled products