when a search in Alexandria waters found that the two cities had been flooded for centuries. Artifacts(史前器物) showed that the cities once highly developed as a trade network, which helped researchers piece together more about the last queen of Egypt.

Machu Picchu

　　A Yale professor discovered "the Lost City in the Clouds" in 1911. A combination of palaces, plazas, temples and homes, Machu Picchu displays the Inca Empire at the height of its rule. The city, which was abandoned in the 16th century for unknown reasons, was hidden by the local people from the Spanish conquerors for centuries keeping it so well preserved.

Troy

　　The ancient city of Troy in homer's The Iliad was considered a fictional setting for his characters to run wild. But in 1871, explorations in northwestern Turkey exposed nine ancient cities layered (层叠) on top of each other, the earliest dating back to about 5,000 years before. It was later determined that the sixth or seventh layer contained the lost city of Troy and that it was actually destroyed by an earthquake, not a wooden horse.

21. Why did people hide in the White City in the 16th century?

A. To protect their country.

B. To search for a lost city.

C. To survive the war

D. To avoid dangerous animals

22. Which of the following was related to a royal family member?

A. Canopus and Heracleion

B. The White City

C. Machu Picchu

D. Troy

23. What can we learn about Troy?

A. It was built by Homer.

B. It was ruined by a natural disaster.

C. It had a history of 5,000 years

D. It consisted of nine cities

Sharenting

　　It's the holiday season, the time when we connect with family and friends. Social media sites like Twitter and Facebook are full of festive pictures, featuring parents' catching and sharing those special family moments, their child's wish list, and maybe even a cute video of their child dancing to "Jingle Bell Rock" while wearing a diaper （尿片） and Santa hat. Swelling with pride, parents can't wait to get approval with a "thumbs up" or better yet a personalized message on their treasured post.

　　Adults should be able to post what they want online. However, when exposing family moments online, are they sharing too much information? Do parents have the right to share those cute now, but embarrassing later moments about kids? Have children willingly given their agreement to sharing their cute but funny video online?

A recent study found that 75% of parents turn to social media for parenting-related information and social support. There is even a term used to describe the overuse of sharing too much information about kids on social media: "sharenting". Research also finds that "sharenting" isn't going anywhere anytime soon. What's troublesome is that a typical parent has about 150 Facebook friends and only a third of them are actual friends. So that brings up good questions - Who are we really sharing our information with and why? Who knows when and where that photo could