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 it is 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
