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问题 选择题

Summer is coming. It's              hot now. [ ]

A. doing

B. getting

C. leaving

D. taking

答案

答案：B

解答题
已知数列an中a1=1，点P（an，an+1）在直线y=x+2上，
（1）求数列an的通项公式；
（2）设Sn=
a1
2
+
a2
22
+…+
an
2n
，求Sn．
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选择题

Thanks for __   __ me to play the guitar. [ ]

A. teach

B.teaches

C.teaching

D.to teach
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