3 . We know more about the surface of the planet Mars than we know about what is at the bottom of Earth’s oceans. Until recently, scientists had mapped only about 20 percent of the sea floor. But our knowledge of the deep sea is changing because of information from satellites. Scientists have produced a new map that provides a detailed picture of the oceans.

The new map is twice as detailed as the map made 20 years ago. David Sandwell is a geophysics professor at the Scripps Institution of Oceangraphy at the University of California. He and other scientists worked on the mapping project. He says they turned to space to look deeper into the ocean.

“The way we’re doing that is to use a satellite altimeter (测高仪) a radar (雷达) to map the topography (地形) of the ocean surface.”

The scientists collected and studied information from two satellites. One was the European Space Agency’s Cryo-2 satellite that was placed in Earth’s orbit to watch sea ice. The other satellite is the American space agancy’s Jason-1, studying the surface of the oceans. Scientists combined the satellite data with images gathered by equipment on ships. The equipment works by sending sound waves through the water. When the sound waves hit something, its existence is confirmed.

The new map shows the sea floor as it has never been seen before. In one place ,three mountain ridges (山脊) join at the same area. “It’s called the Indian Ocean Triple Junction. It’s one of my favorite spots in the ocean. You have three plates — the African plate, and the Indo-Asutralian plate and the Antarctic plate — all connected at this one point in the center of the Indian Ocean,” says David Sandwel.

The map is powerful tool for those interested in protecting the environment and for oil exploration. It also can help ships travel safely and improve scientific projects worldwide. Of course, scientists will make many more discoveries as they examine the new map and the information it provides.

5 . Chloe Smith is a girl aged 6 from Atlanta, Georgia. One day, while taking a walk with her father near their home, she________something shiny under a pile of rubbish. She picked up the ________ to take home, as she often did on her treasure-hunting walks. Chloe was later ________ to discover she had found a stolen Olympic gold medal.

The medal belongs to former canoeist (划艇运动员) Joe Jacobi, who won gold while ________ for Team USA in the 1992 Barcelona Olympic games. The medal, along with other personal belongings, was ________ in May of 2016 when someone broke into Jacobi’s can. Though police managed to ________ some of his stolen items, they hadn’t been able to find his ________ Olympic medal. It may have been lost forever, if not for a 6-year-old girl’s treasure-hunting ________ .

Chloe’s dad had seen Jacobi’s story on the news, and ________ realized it was his stolen property. He found Jacobi’s email and sent him pictures of the treasure. After________ the medal, Jacobi was astonished, just speechless.

Chloe was ________ to give it back after speaking with Jacobi on the phone. ________, Jacobi promised to speak to her class when school begins again this fall. The ________ of this little girl reuniting an Olympian with his beloved possession is ________ . When we talk about character and doing the ________ thing, Chloe represents the Olympic values in every sense of the word.