12、
A.Because every species becomes extinct.
B.Because humans beings are powerful enough to kill other species.
C.Because of over-population.
D.Because though human being is still a yonng species, it is exploiting the environment.
13、
A.He thinks flies will take over the earth.
B.He thinks human will die off quite soon.
C.He thinks mass disease could be the next path to extinction.
D.He sees human beings as destructive.
14、听音频，回答下列14-38题
A.They left their pets with neighbors.
B.They rented their house to a student.
C.They hired someone to stay in their home.
D.They asked their gardener to watch their house.
15、
A.They look at a house sitter's score report.
B.They interview a house sitter's friends.
C.They check a house sitter's references.
D.They attend a house sitter's party.
16、
A.The homeowner is afraid of being accused.
B.The house sitter pleads again and again.
C.Most house sitters are very poor.
D.The homeowner doesn't want to bother.
17、听音频，回答下列17-41题
A.The US should catch up to European environmental standards.
B.American exporters must adapt to new regulations in Europe.
C.The US should be more sensitive to environmental issues.
D.The EU's new regulations are a burden.
18、
A.Their packaging of exports have to conform to EU regulations.
B.They have to cut out waste completely.
C.They must have an experienced distributor.
D.They will see expensive rise.
19、
A.It will allow fewer trees to be cut.
B.It will require less labor costs.
C.It saves some shipping costs.
D.It will make them more competitive.
20、听音频，回答下列20-44题
A.Students from America.
B.Students from England.
C.Students from Australia.
D.Students from Japan.
21、
A.Those who know how to program computers.
B.Those who get special aid from their teachers.
C.Those who are very hardworking.
D.Those who have well-educated parents.
22、
A.Japanese students study much harder than Columbian students.
B.Columbian students score higher than Japanese students in math.
C.Columbian students are more optimistic about their math skills.
D.Japanese students have better conditions for study.
23、
A.Physics.
B.Mathematics.
C.Environmental science.
D.Life science.
24、听音频，回答下列24-48题
A.Factors that affect the ability to memorize.
B.The influence of childhood memories to adulthood.
C.A proposal for future psychological research.
D.Benefits of a busy lifestyle.
25、
A.The need to exercise the memory.
B.How the brain differs from other body tissues.
C.The unconscious learning of a physical activity.
D.How nerves control body movement.
26、
A.Repeat it aloud.
B.Write it down.
C.Make a mental picture of it.
D.Practice recalling it.