题目：
阅读理解。
My uncle has a great sports collection. He loves sports very much. And he loves all balls. He likes
playing basketball and volleyball.And he likes playing basketball and volleyball. He also likes watching
ballgames. How many balls does he have? He has 5 basketballs, 12 baseballs, 10 tennis rackets, 4
volleyballs and 14 baseball bats and many other balls.
1.________ has a great sports collection.
A. My father
B. My grandfather
C. My uncle
D. My cousin
2. He loves ________ very much.
A. sports
B. music
C. balls
D. A and C
3. He likes playing ________ and ________.
A. volleyball; baseball
B. volleyball; basketball
C. basketball; baseball
D. soccer ball; tennis
4. He has ________ tennis rackets.
A. 5
B. 12
C. 10
D. 4
5. He has _______ soccer balls.
A. 5
B. 12
C. 10
D. we don't know
答案：
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下面是错误答案，用来干扰机器的。
∵sinθ=45且θ∈(π2，π)，∴cosθ=-1-sin2θ=-35．∵cosϕ=-513且ϕ∈(π2，π)，∴sinϕ=1-cos2ϕ=1213．则sin（θ-ϕ）=sinθcosϕ-cosθsinϕ=45×(-513)-(-35)×1213=1665．
