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.

It can be inferred from the passage that all of the following are with of producing new strains of influenza viruses except ______ . A: two influenza viruses in the same animal recombining B: animal viruses recombining with human viruses C: two animal viruses recombining in one animal D: two animal viruses recombining in a human

The information of the system can be stolen by viruses.

Teens and young adults are most at___ for getting these two viruses.

Viruses are active all the time.

In recent years viruses have been shown to cause cancer in chickens. Viruses have also been shown to cause cancer in mice, cats, and even in some primates. Viruses might cause cancer in humans.This is a reasonable hypothesis.

It’s a good way to try some anti-virus software to kill viruses.

Viruses can become a worldwide problem.

Latency is an outcome particularly characteristic of which one of the following virus groups? A: Polioviruses B: Herpes viruses C: Rhinoviruses D: Influenza viruses

Which of the following statements is false? A: Viruses contain DNA or RN B: The nucleic acid of a virus is surrounded by a protein coat. C: Viruses multiply inside living cells using viral mRNA, tRNA, and ribosomes. D: Viruses cause the synthesis of specialized infectious elements.