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[主观题]
New moons around the Neptune is one of the important discoveries made in the Manna Kea As
tronomy in the past years.
A．Y
B．N
C．NG
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A．Y
B．N
C．NG
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更多“New moons around the Neptune i…”相关的问题
What can be inferred from the passage about the Jovian planets？
A．Some of the Jovian planets may have conditions that could support life.
B．Jupiter is classified as one of the Jovian planets.
C．Europa is the largest of the moons that revolve around Jupiter.
D．The orbits of the Jovian planets have changed over time.
Europa’ swateryunderworld
Europa, one of Jupiter’s 63 known moons,looks bright and icy on the surface. But appearances can be deceiving: Mileswithin its cracked, frigid shell, Europa probably hides giant pools of liquidwater. Where scientists find liquid water, they hope to find life as well.
Since we can’t go diving into Europa’sdepths just yet, scientists instead have to investigate the moon’s surface forclues to what lies beneath. In a new study, scientists investigated one group of strange ice patterns on Europa and concluded that the formations mark the top of an underground pool that holds as much water as the U.S. Great Lakes.
Pictures of Europa, which is slightlysmaller than Earth’s moon, clearly show a tangled, icy mishmash of lines andcracks known as “chaos terrains.” These chaotic places cover more than half ofEuropa. For more than 10 years, scientists have wondered what causes theformations. The new study suggests that they arise from the mixing of vastunderground stores of liquid water with icy material near the surface.
For scientists who suspect that Europaalso may be hiding life beneath its icy surface, the news about the new lake isexciting.
“It would be great if these lakesharbored life,” Britney Schmidt, a planetary scientist who worked on the study,told Science News. “But even if they didn’t, they say that Europa is doingsomething interesting and active right now.”
Schmidt,a scientist at the University of Texas at Austin, and her colleagueswanted to know how chaos terrains form. Since they couldn’t rocket to Europa tosee for themselves, they searched for similar formations here on Earth. Theystudied collapsed ice shelves in Antarctica and icy caps on volcanoes in Iceland. Thosefeatures on Earth formed when liquid water mixed with ice. The scientists nowsuspect something similar might be happening on Europa: that as water and iceof different temperatures mingle and shift, the surface fractures. This wouldexplain the jumbled ice sculptures.“Fracturing catastrophically disruptsthe ice in the same way that it causes ice shelves to collapse on Earth,”Schmidt told Science News. She and her team found that the process could becausing chaos terrains to form. quickly on Europa.
The new study suggests that on thismoon, elements such as oxygen from the surface blend with the deep bodies ofwater. That mixture may create an environment that
supports life.
The liquid water of an underground pool of Europa is estimated xxxxx of the US Greatlakes.
A. Right
B. Wrong
C. Not mention
When a new vent forms, tube worms congregate around it voluntarily.
A．Y
B．N
C．NG
Nobody can live around the new lake because ______.
A．bottom seepage from the new lake is great
B．one major food source has declined
C．nobody knows for sure where the shoreline will be
D．there is the spread of blood flukes in the area
A.ble to change in new situations
B.time by which you must finish something
C.ind the way around something
D.make something new
Mauna Kea in Hawaii: Astronomy on the World's Highest Island Mountain
Four thousand years ago, a volcano exploded in a far away area of the Pacific Ocean. Today, the Mauna Kea volcano is inactive. It is on the Big Island in the state of Hawaii. It is the highest mountain on any island in the world. It is also the highest mountain in the Pacific Ocean. And it is one of the best places in the world to study the heavens. This is because the air is clear, dry and generally free from pollution. Astronomers from around the world come to the Manna Kea observatory to explore the universe.
Go Up to the Mountaintop
Astronomers must compete for observation time on Mauna Kea. But visitors are welcome any time. They must either walk up more than four thousand kilometers to the top of the mountain. Or they can join a guided vehicle tour that leaves from the Mauna Kea Visitors Center, about two-thirds of the way up the mountain. Erik West is our guide for the trip up the mountain.
Mr. West says visitors who want to drive up the mountain must have a special kind of four wheel-drive vehicle. He also explains some health and safety issues because of the height of the mountain. Being at such a high elevation can affect people's health.
Visitors must not have any heart or breathing problems. They must not have dived deep underwater in the past twenty-four hours. And visitors must be over the age of sixteen.
Now we are ready to drive our vehicles up the mountain. One behind the other, the cars follow a steep road during the forty-five minute drive. They drive over lava rock created by the volcano when it was active.
Tour Around the Astronomy
When we reach the top of the mountain, we get out of our vehicles. We see a group of domed observatories that look like a garden of giant mushrooms. The air up here is cool. Mr. West warns that the air can make people sick because it has forty percent less oxygen than at sea level. He says it has different effects on people. Some people feel light-headed, dizzy or sick to their stomachs. If any people get so sick that they need oxygen, they must leave and go back down the mountain.
The first large telescope was built on Manna Kea in nineteen seventy. Now there are thirteen groups of observatories. One of them is called SMA, or Submillimeter Array. It includes eight different telescopes that operate together. Eleven countries and several universities are involved with the telescopes. Tile biggest telescopes are the ten-meter Keck telescopes. Mr. West says telescopes keep getting bigger because astronomers want to be able to collect as much light as possible.
How the Astronomy Works
The Keck One and Keck Two are world's largest optical and infrared 红外线) telescopes. Their mirrors are divided into thirty-six hexagonal(六边形) parts. They work together as one piece of reflective glass. During the day, Keck One is a sleeping giant of steel devices closed inside a protective covering. The dome covering weighs about seven hundred tons. It is about thirty meters to the top of the dome. The whole minor structure is about twenty-four meters tall.
The real action begins at sundown. The dome opens and starts rotating to where the astronomers need it. The mirror rotates to the place where they will be observing. Throughout the night, the mirror moves to follow an object as it crosses the sky. But the astronomers are not near the telescopes. They are in the control room keeping warm.
Over the years, astronomers have made many important discoveries here. They have discovered new moons around Jupiter (木星). They have taken pictures that help measure the expansion of the universe. They have observed hundreds of small objects orbiting the Sun past the orbit of the planet Neptune(海王星).
Mr. Rolf Kudritzki, the director of the University of Hawaii's Institute for A
A．Y
B．N
C．NG
听力原文：Who's going to show the new employees around？
(A) The show is on Monday.
(B) I think Ms. Stetson will.
(C) Actually, we need something more square.
(21)
A．
B．
C．
A．led
B．lead
C．leader
D．leading
This passage is mainly about ______.
A．the cluster of leukaemia cases around the Sellafield nuclear reprocessing part
B．the kind of infection that causes childhood leukaemia
C．the causes of childhood leukaemia
D．a new finding by British scientists
This passage is mainly about______.
A．the cluster of leukaemia cases around the Sellafield nuclear reprocessing part
B．the kind of infection that causes childhood leukaemia
C．the causes of childhood leukaemia
D．a new finding by British scientists
