Garbage ia a (1)________ problem in the U.S. Every year, Americans produce about 308 billion pounds. A lot of the garbage goes (2) ________the landfills. But many landfills do not have room (3) ________all the garbage. One (4) ________ that one of the garbage problems is recycling. Half of all the garbage in the U.S can be (5) ________and use again. Recycling helps the landfills problem and (6) ________ enough energy too. When people recycling newpapers, they save (7) ________ When they recycling glass, plastic, or cans. They save oil and eceltricity. Recycling is good for everyone.

Garbage ia a (1)________ problem in the U.S.

A. Humans have difficult choices to make about saving endangered species.

B. The existence of humans is at the expense of some other species.

C. No other species can threaten the survival of humans on Earth.

D. Some animals and plants cannot survive without human help.

A. Animal and plant species which pose threats to humans will die out soon.

B. Saving popular animal and plant species should be given a high priority.

C. Humans will make changes in their lifestyles to save other species.

D. The dilemma humans face between maintaining their lives and saving other species remains

A. Humans and endangered species

B. The importance of living organisms

C. Measures to protect endangered species

D. Causes of animal extinction

A. human-related effects

B. some species

C. low birthrates

D. natural obstacles

A. The connections among the creatures in the food chain become closer.

B. Larger predators will look for other types of prey.

C. There might be a lack of food resources for some other species.

D. Animals will shift to another food chain in the community.

A. unimportant

B. unavoidable

C. unexpected

D. unrecognizable