题目内容
（请给出正确答案）
A．4.2 billion years ago.
B．3.3 billion years ago.
C．2.9 billion years ago.
D．1.2 billion years ago.
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A、about 5,000 years ago
B、between 3 and 4 billion years ago
C、between 2 and 3 billion years ago
D、about 500 billion years ago
E、about 10 billion years ago
It took ______ for the world to increase its population from 1 billion to 4 billion.
A) 100 years
B) 145 years
C) 1975 years
D) Over two million years
It took______for the world to increase its population from 1 billion to 4 billion.
A．100 years
B．149 years
C．19 years
D．over two million years
It took______ for the world to increases its population from 1 billion to 4 billion.
A．100 years
B．145 years
C．1975 years
D．over two million years
What is the age of the universe according to the passage？
A．Approximately 10 billion years old.
B．20 billion years old.
C．Approximately 12 billion years old.
D．Not quite accurate now.
It took______ years for world population to grow from 1 billion to 3 billion.
A．100
B．115
C．130
D．145
Thorntec's sales in China reached 2 billion ______ .
A．last year
B．a few years ago
C．seven years ago
A、18 billion years ago
B、4.5 billion years ago
C、18 million years ago
D、20 million years ago
A、Mars was a planet full of life four billion years ago.
B、Mars was a planet full of water four billion years ago.
C、All life on Mars disappeared four billion years ago.
D、All water on Mars evaporated into space four billion years ago.
It can be inferred from the passage that the sun ______ .
A．is approximately halfway through its life as a yellow dwarf
B．has been in existence for 10 billion years
C．is rapidly changing in size and brightness
D．will continue as a yellow dwarf for another 10 billion years
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