如右图所示，圆O的面积为314平方米(π=3.14)，平行四边形ABCD的面积为180平方米，则三角形AB0的面积是()。
A. 49.5平方米
B. 48平方米
C. 47.5平方米
D. 45平方米
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Reading the passage, you might like to help these organizations which work for ______.
A. homeless and sick children
B. less fortunate members of our society
C. hungry people who have no beds to sleep in
D. friendly members of our society to help others
Which of the following is NOT the reason why the flowers in the laboratory open？
A. There was a clock in the laboratory.
B. They have a kind of "biological clock".
C. They have circadian cycles of activity.
D. Their "internal clock" tells them to open.
Why may it happen in the future that people working in Europe will have to pay much higher
A. Because more and more children will be given birth.
Because they will earn more money.
C. Because they will have higher living standards.
D. Because the number of retired people will become even larger.
What happened to the flowers which were put in a laboratory in constant darkness？
A. They didn't open at all.
B. They opened as if they were in a normal garden.
C. They have circadian cycles of activity.
D. They died without knowing the time of day.
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