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【单选题】

My brother is ___ best swimmer in our family.

A.
a
B.
an
C.
the
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【单选题】The rate of extinction is similar to what it was in the age of the dinosaurs.
A.
True
B.
False
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【单选题】People are storing seeds to protect them from extinction.
A.
True
B.
False
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【单选题】About one-half of the world's seeds are in trouble.
A.
True
B.
False
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【单选题】A medicine made from the rosy periwinkle has improved survival rates for children with malaria.
A.
True
B.
False
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【单选题】Changes in temperatures and rainfall are endangering the plants.
A.
True
B.
False
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【单选题】One sixth of all wild plants are used for medicine in developing countries.
A.
True
B.
False
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【单选题】The Millenium Seed Project is in Portland, Oregon.
A.
True
B.
False
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【单选题】Around the world, about a million seeds have been saved in seed banks.
A.
True
B.
False
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【单选题】The seeds of each plant carry all of the genetic information necessary to transfer characteristics from a parent plant to a new plant.
A.
related to nutrition or ingredients
B.
related to development or origin
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【单选题】There are so few members of some plant species left that they are in danger of becoming extinct.
A.
gone forever
B.
overgrown
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