It can be learned that Methuselah ______．
A. is an ancient tree about 2 000 years old
B. is grown from a seed about 2 000 years old
C. had already become extinct 2 000 years ago
D. has been the food source since 2 000 years ago
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The world's birth rate has dropped because_____.
A. people marry at a much later time
B. more birth control devices and methods have been used
C. women would rather go to study or work than have children
D. all the above reasons are true
The celebration of Valentine's Day on February. 14 ______.
A. coincides with the coming of spring
B. remains unexplained in terms of its origin
C. was a choice made by Chaucer and Saint Valentine
D. started in the 14th century and has continued till today
The celebration of Valentine's Day became unfashionable in the ______ century.
A. 14th
B. 15th
C. 17th
D. 19th
What do we know about Methuselah's sex？
A. It will be made clear within a year or two.
B. It will remain a myth for at least a decade.
C. It won't be known until several years later.
D. It won't be decided without ancient knowledge.
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