单项选择题

If English is not our first language, you can often be puzzled by ways of expression that the native speakers of English does not even have to ______

A. think out
B. think about
C. think over
D. think for
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单项选择题
Speciation, ______, results when an animal population becomes isolated by some factor, usually geographic.
A. form biological species

B. biological species are formed
C. which forming biological species
D. the formation of biological species
单项选择题
How did Gabriela Mistral become famous all over the world
A. She won the 1945 Nobel Prize in literature.
B. She was the first woman to win a Nobel Prize.
C. She translated her books into many languages.
D. She advised many statesmen on international affairs.
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