Astronauts on shorter shuttle missions（使命）often work very long days. Tasks are scheduled so tightly that break times are often used to finish the day's work.  This type of schedule is far too demanding for long missions on the International  Space Station（ISS）.  ISS crewmembers usually live in space for at least a quarter of a year. They work five days on and two days off to mimic the normal way they do things on Earth as much as possible . Weekends give the crew valuable.  Weekends give the crew valuable time to rest and do a few hours of  housework.  They can communicate with family and friends by email , internet phone and through Private video conferences.

    While astronauts cannot go to a baseball game or a movie in orbit, there are many familiar activities that they can still enjoy . Before a mission. The family and friends of each ISS crewmember put together a collection of family photos, messages, videos and reading material for

    The astronauts to look at when they will be floating 370 kilometers above the Earth.  During their mission, the crew also receives care packages with CDs, books, magazines, photos and letters . And as from early 2010, the internet became available on the ISS , giving astronauts the chance to do some “web surfing （冲浪）”in  their personal time.  Besides relaxing with these more common entertainments, astronauts can simply enjoy the experience of living in space.

    Many astronauts say that one of the most relaxing things to do in space is to look out the window and stare at the universe and the Earth's vast land mass and oceans.

    Feelings often run high where insects are concerned, with many people even sick when seeing them, let alone touch or swallow them. And yet insects present a huge nutritional opportunity as an increasing global population seeks more sources of food and feed.

    Insects have generally high levels of animal protein and key micronutrients with lower environmental footprints than traditional alternatives, and they can be raised on leftovers. But cultural, social and economic problems remain, reports an article published today in Nutrition Bulletin.

    “Insects present a nutritional opportunity, but it is unclear how their nutritional quality is influenced by what they are fed,” says Darja Dobermann, a researcher at the University of Nottingham. “In ideal conditions, insects have a smaller environmental impact than most traditional western forms of animal protein; less known is how to raise insect production while maintaining these environmental benefits.”

    “Studies overall show that insects could make valuable economic and nutritional contributions to the food or fed systems, but there are no clear regulations in place to bring insects into such supply systems without them turning into a more expensive version of poultry（家禽）for food,” says Dobermann.

    The article highlights how insects have been a source of food for hundreds of years in more than 100 countries with over 2,000 species that can be eaten; in central Africa, up to 50% of dietary protein has come from insects, with their market value higher than many alternative sources of animal protein.

    Insects need to be large enough to make the effort of catching them worthwhile and easy to locate, preferably in predictably large quantities. They are consumed at various life stages, as raw, fried, boiled, roasted or ground food.

    Work started this week on next season's flu vaccine (疫苗), with experts working off forecasts about which types of the flu virus will be making the rounds. But don't expect any improvements. Flu experts are already admitting that most vaccines will give at best basic protection, because they're based on old-fashioned technology. It's not a new problem, but one that the slow-moving world of drug and vaccine production seems helpless to improve upon.

    Every flu vaccine is a cocktail, aimed at either three or four of the most common flu types. Flu vaccines must be recreated every year because flu viruses develop constantly in a process called antigenic drift. In February, global flu experts gather to trade notes on what viruses are circulating in different countries and to come to an agreement on which types the next vaccines should be made to target.

    In recent years, flu vaccines have been based on H1N1, H3N2 and either one or two types of influenza B virus. Each of these has a "reference" type, which is used to make seed virus. Producers add the seed types to eggs and incubate (孵) them as the virus grows. Then they purify the virus, and either weaken it or kill it to make a vaccine.

    Using eggs is a tricky (=difficult) and unpredictable process. Sometimes the virus doesn't grow well in eggs, which can mean less vaccine than expected. The result is a flu vaccine that doesn't offer much protection. "As long as we have eggs we are going to have this problem," said Scott Hensley, a flu virus expert, "The only solution is not to depend on eggs."

    Flu is a major killer. The 2017-2018 season has been a severe one, hitting the entire U. S. with widespread influenza infection (感染) at once for weeks on end, and killing 97 children so far. Against this threat, even a less satisfying flu vaccine will definitely help. "Even when you have these mismatches it will not prevent infection but likely prevent disease severity," said Hensley.

Lots of sports idioms have found their way {#blank#}1{#/blank#} everyday language，{#blank#}2{#/blank#} make language more colourful and expressive.The English language is full of idioms which{#blank#}3{#/blank#} （think）to have come from football，such as "moving the goalposts"{#blank#}4{#/blank#} （mean）they unfairly change the rules or{#blank#}5{#/blank#} （require）of a process while "scoring an own goal"means that someone makes a bad mistake which {#blank#}6{#/blank#} （intention）harms their own interests.Baseball is another old and popular sport that has given the English language many different idioms. "Three strikes and you are out" is also an idiom that is often used to talk about situations {#blank#}7{#/blank#} you miss three chances.English also has a large number of idioms{#blank#}8{#/blank#} （relate）to boxing，which has been a popular sport for thousands of years.Sport is {#blank#}9{#/blank#}（challenge） and so is the study of the English language.Work hard，be careful not to score {#blank#}10{#/blank#} own goal，and you are sure to make it!

As the Chinese saying goes, a seed can change the world; a variety can benefit a nation.

Zhang Daorong, who has spent the last 26 years 1 13 new varieties of wheat and contributing to national food security, has done both. The 50-year-old, who is called the "mother of wheat", is a 2 at the Xiangyang Academy of Agricultural Sciences in Xiangyang city.

The research into new varieties requires strict standards and 3 experiments. "The first 4 is to find suitable parental types for a specific cultivation(培育) purpose. Then we try a hybrid(杂交的) combination," Zhang explained, "After several generations of 5 and selection, and when characteristics remain stable, we 6 a two-year process of yield testing and disease identification." And after several more founds of tests, a(n) 7 for evaluation and approval can be made for market production.

"Generally speaking, a good new 8 should produce high yields(产量), have stable production, and 9 good resistance to bad conditions," she added. "10 , it also should be accepted by the market."

Zhang added that the team 11 70,000 to 80,000 seedlings(幼苗) each year. All year round they were busy with 12 experiments on the growth of the new seedling sand making records and analyses.

"Agricultural research work is 13 and complicated. Sometimes your efforts do not 14 . All we can do then is think more, discuss more and find 15 on the land," she said.

Not long ago, my daughter's shoes {#blank#}1{#/blank#}(damage) with a knife. She burst into tears. I took them to the shoemaker's. The man said he would add more scratches on both shoes as if the openings were made on purpose for a special style. I didn't fully understand him, but I decided to leave the shoes. Two days later I dropped by from work {#blank#}2{#/blank#}(collect) the shoes. I found more scratches on each shoe, but all the openings were patched by red leather and the stitches were twisted. The appearance looked {#blank#}3{#/blank#}( interesting) than ever.

The African penguin is expected to go extinct in the wild in just over a decade, given its current population decline. The main reason is a lack of food caused by disturbance to ocean conditions from global heating and {#blank#}4{#/blank#}(compete) from the commercial fishing industry. According to a study, recently scientists {#blank#}5{#/blank#}(identify) a possible additional cause, one that is an entirely new threat and that further {#blank#}6{#/blank#}(prevent) the penguins from finding food: noise pollution from marine ships in a bay.

Crying is a natural response to emotions. Regardless of{#blank#}7{#/blank#} causes the tears to flow, the physical reaction is usually the same with puffy cheeks and tight eyes {#blank#}8{#/blank#}(lead) to streaming tears down one's face. Despite its stigma(污名), crying can be an act {#blank#}9{#/blank#} relieves tension and clears feelings of negativity and sadness. Crying can communicate our emotions to others and foster greater understanding and compassion. Ultimately, crying is a powerful tool we ought to use to free ourselves {#blank#}10{#/blank#} negativity.