Sally can upgrade her anti-virus software for free.
举一反三
- Sometimes passengers can upgrade their class for free.( )
- Why can’t Sally play A: Her mother. B: Her sister-in-law. C: Her aunt.
- It’s a good way to try some anti-virus software to kill viruses.
- Which of the following can be inferred from the passage A: There are useful viruses as well as harmful ones. B: Many virus checking software is free of charge. C: Even if you take the advice, your computer may still be infected with viruses. D: Shut down your computer whenever there is a virus.
- Anti-Virus software protects your computer from viruses by ( ) your computer's memory and disk devices.