12.What aspect of trees does the professor mainly discuss ?
A.The difference between deciduous and coniferous trees ?
B.The purpos of roots ,bark ,and leaves
C.The dangers of people cutting down too many trees
D.The ways that trees benefit mankind
13.What are the major differences between deciduous and coniferous trees?
A.Their eds ,flowers, and leaves
吨的认识B.Their eds,cones and bark
C.Their roots ,eds and leaves
D.Their bark eds and leaves
14.Listen again to part of the lecture,Then answer the question.
A.She thinks that all logging companies are doing the right thing.
B.She feels that logging companies could do more to prerve forests
口红涂法
C.She wants logging companies to stop all logging immediately
D.She expects logging companies to pay more money for their trees
15.How does the professor organize the discussion of the structure of trees ?
A.By using different examples of trees as a focus point
B.By examining the different scientific ways to examine trees
C.By looking at each part of the tree and its purpo
D.By describing the chemical process going on in trees
16.Which statement is associated with which part of the tree?
| Roots | Bark | Leaves |
神经病症状A.Achemical reaction takes place here | | | |
飞上月球B.This part absorbs water from the ground | | | | 我的家族史
| 山的成语 C.The absorption of carbon dioxide and relea of oxygen occur here | | | | 祭奠读音
D.This part can be ud to check the history of local rainfall | | | |
| | | |
17.What can be inferred about the Amazon rainforest from the lecture ?
A.It is in no immediate danger at the moment
B.It is being logged ,but it is being replanted介绍故宫
C.It provides many important elements for Earth
D.It is in danger from logging companies
