句型转换。

1. He has a ball. (一般疑问句)

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2. The boy does his homework every day. (否定句)

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3. Cats eat fish. (否定句，划线提问)

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4. He is 13 years old.(划线提问)

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5. Simon plays football after school. (划线提问)

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6. He enjoys watching TV in the evening. (划线提问)

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7. I have lots of friends at Beijing Sunshine Secondary School.  (划线提问)

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账龄超过5个月的应收保费需要提取（）比例的坏账准备金。

A.10%

B.20%

C.50%

D.90%