阅读理解。
● AC Milan star Kaka says a foot injury (受伤) is still stopping him from returning to football. He has
not played for 32 days. Kaka says he is in a lot of pain. "I hurt myself in an area that we always put pressure
(压力) on." Kaka once played for a year with a knee injury, but the 26-year-old said this is much worse.
● British actress Emma used to spend more time filming than at school. But today she is ready to pay
more attention to her studies. This 19-year-old girl will start at the Yale University in the autumn. "I always
loved school. I just want to go back and find what else there is," she said.
● Chinese 25-year-old sports star Liu Xiang returned to Shanghai in March. He had a successful foot
operation (手术) in December in Houston, and spent the next three months there for recovery (康复) and
basic training. It is said that a group of doctors are ready to help with Liu's recovery.
● Russian great tennis player Sharapova will not be playing in the MPS Group Championships, which
begins in the US on Monday. Sharapova was missing the Sony Ericsson Open the week before last in Miami.
She may continue training for the WTA Rome event at the beginning of May.
1. Liu Xiang's foot operation was successfully done in December in . [ ]
A. Miami
B. Rome
C. Houston
D. Shanghai
2. How long has Kaka not played football because of his foot injury?[ ]
A. More than a month.
B. About a year.
C. Two weeks.
D. Three months.
3. Which of the following is RIGHT?[ ]
A. Emma started school at the age of 19.
B. Sharapova may play in the WTA Rome evernt.
C. Kaka was hurt by other players.
D. Liu Xiang returned to Shanghai for an ad.
4. Among the four persons, isn't a sports star. [ ]
A. Sharapova
B. Liu Xiang
C. Emma
D. Kaka
为16cm／kV。每片XP-7绝缘子的泄漏距离L为290mm，试确定悬式绝缘子串的绝缘子片数。