题目内容
（请给出正确答案）
Tennis balls ______ best in summer.
A) sell B) are on sell
C) will be sold out D) will be on sell
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更多“Tennis balls ______ best in summer. A) sell B) are on sell C) will be sold out”相关的问题
A、barrier property
B、thermal property
C、electrical property
D、mechanical property
Designed by Bigelow Aerospace, the inflatable space habitat is one area NASA is exploring for potential deep space habitats and other advanced space missions. “The ‘Bigelow Expandable Activity Module,’ or the BEAM, is an expandable habitat that will be used to investigate technology and understand the potential benefits of such habitats forhuman missions to deep space, ” NASA Administrator Charles Bolden wrote in a blog post.
The habitats could be a way to “dramatically increase ” the space available for astronauts while also offering added protection from the dangers of space, like radiation and space debris, the NASA press release says.
But how is an inflatable space station supposed to be a viable means of housing for space travelers？ BEAMs are far more than balloon-like rooms where astronauts can take asylum. Technically, the modules don’t inflate― they expand, according to the company. And beyond just air, the habitats are reinforced with an internal metal structure. The outside is composed of multiple layers of material including things like rubber and kevlar to protect from any speeding debris.
Inside SpaceX ’s Dragon spacecraft on the way to the ISS, the BEAM will be approximately 8 feet in diameter. It will expand once deployed in space to offer 565 cubic feet of space for astronauts. “It’ll be the first time human beings will actually step inside this expandable habitat in space,” former astronaut George Zamka, who has worked for Bigelow Aerospace, told USA Today. [“There won’t be this sense of it being like a balloon. ”]
But astronauts won’t be getting inside the module for some time yet.The BEAM will be attached to the Tranquility Node and deployed. Inside the module are a series of tools that will help the crew of the ISS monitor different aspects of the expandable area to see how it acts in space. The crew will watch heat, radiation, orbital debris, and provide information about the viability of using similar modules in the future.
The testing is scheduled to go on for a two-year time period, after which the module will be released and burn up in the atmosphere. NASA’s partnership with Bigelow fits Mr. Bolden ’s desire to help grow a robust private sector industry to commercialize aspects of space ― a process he sees as vital if humans want to reach farther cosmic destinations. “The world of low Earth orbit belongs to industry, ” Bolden said at a press conference in January .
What is special about the new living module on SpaceX ’s eighth mission to ISS？
A.It is expandable.
B.It is going to deep space.
C.It looks like a toy.
D.It will not return to Earth.
What is the purpose of designing the inflatable space habitat？.A.It is to find out its potential capacity.
B.It is to give a try on a new technology.
C.It is to save time and money in production.
D.It is to see if it can be applied in deep space.
What does the underlined sentence in Paragraph 5 mean？A.The habitat will not be a balloon-like room.
B.The habitat will not feel like a balloon.
C.The habitat will be like a senseless balloon.
D.The habitat will be a different kind of balloon.
Why does NASA intend to commercialize aspects of space？A.It can save NASA time and energy.
B.It is necessary for a robust industry.
C.It is crucial for further space explorations.
D.It meets both NASA ’s and Bigelow ’s needs.
Rebecca Lobo, a basketball star, grabbed a rebound during the first seconds of game in June 1999. (46) . A pain shot from her knee and drove Lobo to the floor. Tests revealed that Lobo had tom her anterior cruciate (十字的,交叉的) ligament (韧带), or ACL, resulting in the end of her play for the season. (47) .
Lobo, perhaps the most recognized player in the United States, is one of a growing number of female athletes suffering ACL injuries. Experts say that female athletes in middle school, high school, college and professional sports may be eight times as likely as male athletes to experience ACL injury.
(48) . Why are so many female athletes falling victim to ACL injuries？
Sports physicians say one reason is the growing number of females involved in high-impact sports, such as soccer and basketball. Jeff Bauer, a biochemist, however, thinks bone size plays a key role. He examined the knee joints of skeletons of 200 humans who had died at an early age.
Studies of the skeletons of 100 males and 100 females showed in measurement after measurement that the bones making up a female&39;s knee are smaller than those of a male of the same size. Smaller bone surfaces may lead to an increase in stress placed on the ACL during sharp movements, such as turning, jumping, or stopping.
Bauer thinks the size difference may be the primary reason that females injure their knees more often than males do with the same amount of training and experience. "Now, that&39;s not bad, "adds Bauer, "and it&39;s not good. It&39;s just different."
Following the knee injury, Lobo underwent surgery. (49) . After the surgery, the patient needs months of physical therapy to strengthen the knee muscles and ligaments. Eight months after having knee surgery, the patient still needs to exercise her knee every day.
(50) . They also recommend that players do stretching exercises before a game or a practice to help keep the knees flexible and more able to withstand stress during play.
46
A. When she landed, she tried to stand firm but couldn&39;t.B. One of the more common techniques used to repair a torn ACL involves replacing the entire ligament.C. Sports injury experts say knee exercises may help protect knees from ACL injury.D. Practice before and after a game is a good way to avoid injuries to knees.E. Thousands of female athletes have suffered a fate similar to Rebecca&39;s.F. The ACL is a short band of tissue that keeps the knee stable during movement.
47
A. When she landed, she tried to stand firm but couldn&39;t.B. One of the more common techniques used to repair a torn ACL involves replacing the entire ligament.C. Sports injury experts say knee exercises may help protect knees from ACL injury.D. Practice before and after a game is a good way to avoid injuries to knees.E. Thousands of female athletes have suffered a fate similar to Rebecca&39;s.F. The ACL is a short band of tissue that keeps the knee stable during movement.
48
A. When she landed, she tried to stand firm but couldn&39;t.B. One of the more common techniques used to repair a torn ACL involves replacing the entire ligament.C. Sports injury experts say knee exercises may help protect knees from ACL injury.D. Practice before and after a game is a good way to avoid injuries to knees.E. Thousands of female athletes have suffered a fate similar to Rebecca&39;s.F. The ACL is a short band of tissue that keeps the knee stable during movement.
49
A. When she landed, she tried to stand firm but couldn&39;t.B. One of the more common techniques used to repair a torn ACL involves replacing the entire ligament.C. Sports injury experts say knee exercises may help protect knees from ACL injury.D. Practice before and after a game is a good way to avoid injuries to knees.E. Thousands of female athletes have suffered a fate similar to Rebecca&39;s.F. The ACL is a short band of tissue that keeps the knee stable during movement.
50
A. When she landed, she tried to stand firm but couldn&39;t.B. One of the more common techniques used to repair a torn ACL involves replacing the entire ligament.C. Sports injury experts say knee exercises may help protect knees from ACL injury.D. Practice before and after a game is a good way to avoid injuries to knees.E. Thousands of female athletes have suffered a fate similar to Rebecca&39;s.F. The ACL is a short band of tissue that keeps the knee stable during movement.
A、il y a un mois
B、pendant un mois
C、depuis un mois
D、dans un mois
A) composes of B) composes in C) consists of D) consists in
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