【单选题】Eight thousand years ago, forests covered more than 23 million square miles, or about 40 percent of Earth's land surface. Today, almost half of those forests have fallen to the ax, the chain saw, the ...
A.
The present situation of frontier forest on Earth.
B.
The history of ecology.
C.
The forest map in the past.
D.
Beautiful forests in different parts of the world.
【简答题】Watch the video clip. U5_1_1d.wmv Then find out: the expressions you can use to share your opinions about your dream jobs; the occupations mentioned in the video.