A．Waste products that can be prevented or disposed of sensibly.
B．Artificial and natural substances released into the environment.
C．Advertising that persuades people into buying products.
D．Nuclear power stations that cause ecological imbalance.
A．The farmers stop using any fertilizer.
B．The farmers stop using the farmland too heavily.
C．The farmers stop using farming machines.
D．The farmers stop growing with new methods.
A．Cutting out unnecessary buying.
B．Cutting out excess consumption.
C．Cutting out advertising expense.
D．Cutting out careless disposal of daily necessities.
A．He wants the woman to explain her major.
B．The woman is from a famous tmiversity.
C．The woman's major is irrelevant to a tour guide.
D．He is also from that university.