[不定项选择题]共用题干 Ecosystem

1 The word " ecosystem" is short for ecological（生态的）system. An ecosystem is where living crea-
tures expand within a given area.You can say that an ecosystem is the natural environment where biological
organisms（生物）such as plants,animals and humans co-exist in this world. So naturally that includes you
and mne.Yes,we are all members of an ecosystem!
2 There are different kinds of ecosystems depending on the type of suiface or environment. Most are
naturally made 5uch as the ocean or lake and the desert or rainforest.Some are man-made or artificial to en-
courage co-habitation（共居）between living and non-living things in a monitored environment,such as a
zoo or garden.
3 Plants make up the biggest group of biological creatures within an ecosystem,and that's because
they are the natural food producers for everyone.Plants raised in the earth need air and collect sunlight to
help them grow.When they grow,the plants and their加its or flowers eventually become a source of food to
animals,microorganisms (微生物）and even humans, of course. Food is then converted to energy for the rest
of us to function,and this happens in a never-ending cycle until the living creatures die and break up back
in the earth.
4 Ecosystems are the basis of survival for all living things.We depend on plants and animals for food.
In order for us to exist,we need to grow and care about other organisms.We also need tO care for the non一living
things within our environment like our air and water so we can continue living as a population.Since plants,
animals and humans are all of various species（物种）,we all play a role in maintaining the ecosystem.
5 To preserve our ecosystems,we should stop using too much energy,which happens汕en we consume more
than our share of resources. Humans should not disturb the natural habitat（栖息地）of plants and animals,
and should allow them to grow healthily for the cycle to continue.Too many people in a habitat can mean dis-
placement（搬迁）:imagine being thrown out of your home because there is no more space for everyone.
Worse,overpopulation can also ruin the environment and cause destruction of existing plants and animals. Paragraph 2_______
A.What Can We Do to Help Protect Ecosystems?
B.What Are Different Types of Ecosystems？
C.What Is an Ecosystem？
D.What Destroys Ecosystems?
E.How does an Ecosystem Work?
F.Why Are Ecosystems Important？