( 45 ~ 46 )                                                                    The Trojan HorseViruses, worms, Trojan horses—all of these are programs that can do serious damage toyour computer. Trojan horses are particularly difficult to avoid, as they seem perfectly harmlessat first. A Trojan horse might disguise itself as an email attachment or a fun-looking download.Then, when it’s inside your computer, it steals all your personal data or deletes all your files.But where does the term Trojan horse come from? A long time ago, a war is said to havebeen fought between Greece and the city of Troy. The wall around the city was so high and strong that the Greeksjust couldn’t get inside. After 10 years of war, the Greeks finally came up with a plan. They built a huge woodenhorse and hid soldiers inside it. Then they pretended to sail home. The Trojans, thinking they had won the war,took the horse inside their city walls to celebrate their victory. That night, the soldiers inside the horse jumped outand opened the city gates. The rest of the Greek army, which had sailed back to Troy secretly in the night, enteredthe city and destroyed it.

【題組】45. What is the writer trying to teach readers about?
(A) The history of cheating.
(B) The dangers of the Internet.
(C) The source of a phrase.
(D) Ancient Greek culture.