任务一 完形填空
Ecosystems are networks where living things connect with their environment. The ocean, covering 71% of the earth's
1, is the largest ecosystem. It produces most of the planet's oxygen through tiny plants. However, human activities like fishing and pollution have
2 its balance.
Wetlands, though small, play a(n)
3 role. They act like sponges during rains,
4 floodwaters and cleaning pollution. Sadly, many wetlands have been lost due to farming and urbanization(城市化).
Forests, called the earth's "lungs",
5 carbon dioxide and give out oxygen. Rainforests, home to many animals, are becoming smaller. Cutting down trees and fires destroy them. If this continues, some animals may
6 forever.
Even deserts,
7 they are dry, are ecosystems. Desert plants store water in leaves, while animals like camels
8 heat. Climate change makes deserts hotter, threatening their survival.
Polar ecosystems are also in danger. Melting ice harms polar bears and penguins,
9 need ice to hunt. Scientists say if temperatures rise, these places may change
10
.
Protecting ecosystems needs everyone. Governments should make laws to stop pollution. People can help by using less plastic and
11
eco-friendly products. Teaching kids about nature helps them
12 good choices later.
Small actions matter. By working together, we can bring
13
between humans and nature, saving all living
14
. Remember: protecting ecosystems means protecting
15
.
(
A
) 1. A. surface B. bottom C. height D. land
(
B
) 2. A. kept B. broken C. closed D. improved
(
B
) 3. A. useless B. important C. careful D. strange
(
D
) 4. A. training B. taking C. hiding D. stopping
(
B
) 5. A. give out B. take in C. put away D. look for
(
A
) 6. A. disappear B. grow C. leave D. produce
(
C
) 7. A. if B. however C. though D. whenever
(
B
) 8. A. hate B. survive C. avoid D. have
(
D
) 9. A. what B. when C. who D. which
(
C
)10. A. a few B. a little C. a lot D. slowly
(
C
)11. A. breaking B. selling C. buying D. throwing
(
D
)12. A. hide B. decide C. pick D. make
(
B
)13. A. health B. peace C. noise D. calm
(
A
)14. A. things B. machines C. places D. materials
(
D
)15. A. itself B. we C. our D. ourselves
