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1 . Native species ______.

• Are not used to the local environment

• Never get along well with other native species in the same environment

• Tend to do harm to exotic species

• Have been part of a given biological landscape for a long period

2. Exotic species.

• help to make the local environment more ideal to survive

• always share the environment peacefully with native species

• may kill native species for food

• do no harm to native species and the local environment

3. According to the first paragraph,

• non-native species have caused badly damage to native ones

• introducing new exotic species to local environments is necessary

• exotic species have never been introduced on islands

• very few native species have been damaged by exotic species

4.According to the second paragraph, by the middle of the 20 century

• whale population was the most crowded in marine life

• whale hunting was illegal

• whale population increased dramatically

• whaling was not restricted

5. Tiger bone and rhino horn

• are not popular in Asian markets

• are never in the trade of animal parts

• are used for making traditional medicines

• cannot be found in Asian markets

1. According to the first paragraph.

• species extinction is only caused by hunting

• human beings protect wife life much more than they do harm to them

• the main cause of species extinction is human activities

• we can stop radically species extinction by 2025

2. The North American bison

• was completely extinct in 1800s

• was not the aim of human hunting

• was raised by settlers in 1800s

• has escaped from extinction thanks to conservationists

3.Species are categorized,

• to prevent hunting

• to provide food

• to destroy their habitats

• to give preferential right to conserve

4.Which sentence is true?

• Medicine is not a factor to cause species extinction.

• The list which conservationists present does not include all kinds of species.

• Pollution does nothing to species extinction.

• Conservationists have good knowledge of all kinds of mollusks.

5. According to the last paragraph.

• species extinction has no relationship to human beings

• what threaten plants and animals can do nothing to human beings

• human beings depend on natural resources to survive

• not every, species has a role in the circle of life.