Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
Probability of extinction depends _______ both the population size and fine details of the population demography.
A.on
B.in
C.from
D.for

Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
Many modern medicines are derived _______ plants and animals.
A.on
B.for
C.from
D.in

Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
A / an _______ species is a population of an organism which is at risk of becoming extinct.
A.dangerous
B.endanger
C.endangered
D.endangerment

Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
_______ is a branch of Natural Science, and is the study of living organisms and how they interact with their environment.
A.Biology
B.Biological
C.Biologist
D.Biologically

Choose the word which is stressed differently from the rest.
A.government
B.agency
C.benefit
D.diversity

Choose the word which is stressed differently from the rest.
A.temperature
B.serious
C.awareness
D.chemical

Choose the word which has the underlined part pronounced differently from the rest.
A.attitude
B.survive
C.introduce
D.human

A.inspiration
B.collection
C.reputation
D.limitation

A.compulsory
B.convenient
C.correspond
D.corrununicate

They................ all day swimming and sunbathing at the beach.
A.passed
B.used
C.took
D.spent