Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
It is found that endangered species are often concentrated in areas that are poor and densely populated, such as much of Asia and Africa.
A.disappeared
B.increased
C.threatened
D.reduced

Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
15,589 species (7,266 animal species and 8,323 plant species) are now considered _______ risk _______ extinction.
A.at / of
B.on / in
C.for / with
D.in / at

Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
All the countries of the area have _______ to protect their wildlife but they are rarely enforced.
A.efforts
B.laws
C.results
D.reserves

Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
Humans depend on species diversity to provide food, clean air and water, and fertile soil for agriculture.
A.raise
B.produce
C.supply
D.reserve

Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
Although we are aware _______ the importance of environment, we still overexploit it.
A.from
B.on
C.for
D.of

The train will leave in five minutes so you _________ better hurry up.
A.had
B.should
C.will
D.would

Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
They have built a particular reserve' which is suitable _______ pandas.
A.at
B.upon
C.in
D.for

Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
Contamination and global warming have driven many species of animals and plants _______ the threat of extinction.
A.for
B.to
C.with
D.on

Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
_______ is the protection of environment and natural resources.
A.Survival
B.Commerce
C.Conservation
D.bridge

Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
Over-exploitation for food, pets, and medicine, pollution, and disease are recognized _______ a serious threat _______ extinction.
A.as/ of
B.to/ for
C.over/ with
D.upon/ at