从2002年到2050年增长的老年人数占2002年世界总人口的比例是：
A. 11%
B. 21%
C. 31%
D. 37%
This passage is mainly about______．
A. why "Good Morning to All" was replaced by "Happy Birthday to You"
B. how the song "Happy Birthday to You" was composed
C. the history of the song "Happy Birthday to You"
D. why the song "Happy Birthday to You" is popular
The song "Happy Birthday to You" was originally written for______．
A. The kids in kindergarten
B. the children in elementary school
C. the teenagers in middle school
D. the adults
For a reader, what is the most important？
A good book．
B. Avoiding any mistake．
C. The purpose of reading．
D. Reading many books．
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