设f（x）为定义在R上的奇函数，当x≥0时，f（x）=2x+1+2x+b（b为常
题型：填空题
问题：
设f（x）为定义在R上的奇函数，当x≥0时，f（x）=2x+1+2x+b（b为常数），则f（-1）=______．
题型：填空题
In the past, when people had problems, they went to their families or friends to get advice.
Today it is possible to get advice from radio shows, TV programmes
and telephone hot lines, too. A hot line is a telephone line that offers a direct way of getting in touch with advisers .Most hot lines are completely anonymous ,that is to say , callers do not have to say their names or telephone n
umbers. Most hot lines are usually free. Callers do not have to pay for the advice or the phone calls, even if the calls are long distance ones. At some hot lines, the advisers are volunteers. Other hot lines pay their advisers for their work. Usually the advisers are full-time people with years of education and experience, but sometimes, the advisers have only taken a short training before starting to work on the hot lines. All the advisers listen to people and help them solve their problems
56. A hot line is a telephone line_________
A that is hot B through which people get advice
C whose number no one knows D through which callers take a short training
57. the underlined word“anonymous”in the passage means_________in Chinese.
A secret B well-known C exact D wonderful
58. When people call the hot line advisers, they_________
A often give their names and telephone numbers
B generally have to pay for the long distance calls
C usually pay nothing for most of the calls and advice
D always try to get in touch with the volunteer advisers
59. The advisers working at hot lines _________
A have all been trained for a short time
B are all volunteers
C have all received years of education
D are not all paid
60 The writer of the passage seems to think that_________
A hot lines help the callers a lot
B advisers will solve all of the callers’ problems
C people had better pay for the advice
D people will not get advice from their families or friends