Download Unit 7 課本習題參考解答

Unit 7 課本習題參考解答
Before You Read
A→E→B→C
After You Read
Reading Map
1 D 2A 3 B 4 G 5 E
Comprehension Check
6C
7F
1C 2D 3D 4C
Questions for Discussion
課本習題參考解答
1 According to the reading, all the species on Earth, including animals, plants, and microorganisms,
have important roles to play. The range and variety of life within an ecosystem, such as a rain
forest, a desert, or even the entire Earth, is referred to as biodiversity. Healthy biodiversity helps
insure a balanced ecosystem and the survival of all the species within it. This is the reason why it
is important to conserve our planet's biodiversity.
2 I don't think it is very sensible to cut down other local trees to make room for more tung flowers.
Tung flowers are indeed very beautiful, and many people enjoy the wonderful sight of
flower-capped mountaintops. However, all trees are an essential part of nature, and we should
not cut down certain trees just because other kinds of trees have flowers that are considered to
be “more beautiful.” In fact, as far as species diversity is concerned, the balance of an
ecosystem cannot be sustained without protecting as many species as possible. Leaving nature
as it is may be one of the best ways to take care of our already endangered planet.
Patterns in Use
句型一
Exercise A
1 Stella bought two books, both of which were adventure novels.
2 The store has hired several young clerks, none of whom is above 30.
3 At the party, Ted chatted with many people, some of whom were his high
school classmates.
4 There are many convenience stores in Taiwan, most of which are equipped
with ATMs.
Exercise B
2 one of which was that he fell in love with his boss's daughter
3 two of whom even work in the same company
4 most of whom are fair-weather friends
5 all of which were sold within five years
句型二
Exercise A
1 with the environment changing too rapidly, ecosystems and species will not have enough time to
adapt
2 With more and more carbon dioxide trapped in the atmosphere, the temperature on Earth has risen
very quickly
3 With more and more floating sea ice melting, polar bears are no longer able to find a place to rest
4 The ocean has become more acidic with more carbon dioxide absorbed in it
Exercise B
1 with his arms folded under his head
2 with a briefcase held in his hand
3 With tears streaming down her face
4 With her heart beating faster and faster
Beyond the Text
1A 2 C
3B
Writing Hands-on
Exercise A
1 (A) Growing up means becoming mature and having to be responsible.
(B) Growing up means not making complaints without any reason.
2 (A) Happiness is a feeling of being pleased and satisfied.
(B) Happiness is feeling like smiling all the time.
3 (A) A true friend is one who offers help without asking anything in return.
(B) A true friend shares both joy and sorrow.
Exercise B
I
Flora, fauna, and microorganisms of all species have important roles to play in the natural
balance of life on Earth. A group of different organisms, together with the environment they live in,
form what is called an “ecosystem,” which consists of various plant and animal species, and their
habitats. To maintain the balance in an ecosystem, biodiversity is the key.
All species on Earth have important roles to play. For example, bees carry pollen from plant to
plant during their search for food. If bees became extinct, many important plants would not be
pollinated, and would fail to bear flowers, fruit or grain. For human beings, crop yields would fall
abruptly, inevitably causing food shortages to arise around the world. Hence, it is no exaggeration to
say that bees are of the utmost importance to human survival.
Biodiversity is the key that ensures the balance of the world's ecosystems and the continued
survival of all the life. Biodiversity includes genetic diversity, species diversity, and habitat diversity.
Different genes, different species, and the natural habitats allow species to grow and develop.
II
Happiness is a feeling of being pleased and satisfied. When you are happy, your mind is filled
with comfort, peace, and love. The feeling of happiness has nothing to do with wealth, status, or
power.
The feeling of happiness enriches life. In a state of happiness, people tend to think of more
good things than bad. Therefore, it makes you look friendlier and easier to get along with. As a
result, you will be more likely to have more friends, which will in turn bring more happiness. If you
are happy, you will also tend to look on the bright side of things. If you are happy, you will be less
likely to complain and you have even more opportunities to be successful.
Happiness is a mental state. No matter what difficulty is in your way, the feeling of happiness
will help you overcome difficulty, making you more likely to return to the state of happiness. This is
so­called the “virtuous circle.”