数字签名可以保证信息传输的()。

A．完整性

B．真实性

C．完整性和真实性

D．机密性

句型转换。

1. Is this girl your sister? She looks like you.(改为同义句)

    Is this girl your sister? She______            you.

2. Hurry up! The headmaster is giving out festival presents.(改为同义句)

    Hurry up! The headmaster is                       festival presents.

3. We'd like to set up a bookshop to buy and sell all kinds of books.(改为一般疑问句)

     __  __ you            to set up a bookshop to buy and sell all kinds of books?

4. I spent 20 dollars on my new dress.(对画线部分提问)

                                      you             on your new dress?

5. run, out, of, Jimmy, money, buy, to, had, dictionary, English, an(连词成句)

                                                                        .