7 . Unwrapping your shopping to find you have bought mouldy (发霉的) bread, rotten fruit and sour milk could soon become a thing of the past, thanks to the range of emerging 'active packaging' technologies. While traditional packaging simply _______ a barrier that protects food, active packaging can do a lot more. Some materials _______ with the product to improve it in some way, or provide better information on the state it is in. _______, they may absorb oxygen inside a wrapper to help prevent food spoilage or show whether potentially dangerous foods like red meat and chicken have been stored at unsafe temperatures.

One of the new breed of packaging technologies that have just gone on the market in France is a ‘time temperature indicator’. Stores where the product has already been introduced report that far fewer consumers are returning _______ food. The indicator is basically a label that _______ the temperature a package has been kept at and for how long. The label has a dark ring around a lighter circle. The central ring contains a chemical which polymerises (聚合), changing colour as it does so from _______ to dark. If the package stays cool, the reaction is slow, but increasing the temperature speeds up the polymerization. When the inner circle darkens, it means the product is no longer _______ fresh.

Smart packaging can also control the _______ of the atmosphere inside a container. For instance, the make-up of oxygen (O2) and carbon dioxide (CO2) within packaged vegetables will influence their freshness. This can be hard to control in a sealed package, since vegetables _______ more oxygen and give off more carbon dioxide as the package gets warmer. A firm in California is trying to solve the problem with a wrapper it calls ‘Intelimer’ which changes its permeability (渗透) as the temperature changes in a way that keeps different produces at their best O2/CO2 ________.

Decay can also be ________ by controlling the environment inside a package with an ‘oxygen scavenger’(清除剂). ________, this is achieved by placing a small bag filled with iron powder in the package — any oxygen in the package is consumed by the iron as it oxidises. However, consumers don't ________ finding small bags marked ‘Don't eat in their food’, so a company in New Jersey is making a wrap that itself consumes oxygen. The ________ includes an inner layer of an oxidisable polymer (聚合物) that traps oxygen in the same way as iron.

It is predicted that between 20 and 40 per cent of all food packaging will soon be ________.

8 . Is loyalty in the workplace dead?

Just recently, Lynda Gratton, a workplace expert, proclaimed that it was. In The Financial Times, she said that it had been “killed off through _________ contracts, outsourcing, automation and multiple careers.”

It’s sad if this good virtue is now out of place in the business world. But the situation may be more _________. Depending on how you _________ it, loyalty may not be dead, but is just playing out differently.

Fifty years ago, an employee could stay at the same company for decades, said Tammy Erickson, an author and work-force consultant. Many were _________ longtime employment along with health care and a pension.

Now many companies cannot or will not hold up their end of the bargain, so why should the employees hold up theirs? Given the opportunity, they’ll take their skills and their portable retirement accounts elsewhere. These days, Ms. Gratton writes, _________ is more important than loyalty: “Loyalty is about the future - trust is about the present.”

Ms. Erickson says that the quid pro quo (交换物，报酬) of modern employment is more likely to be: As long as I work for you, I promise to have the relevant skills and _________ fully in my work; in return you’ll pay me _________, but I don’t expect you to care for me when I’m 110.

For some baby boomers, this _________ has been hard to accept. Many started their careers _________ that they would be rewarded based on tenure (任职).

A longtime employee who is also productive and motivated is of enormous value, said Cathy Benko, chief talent officer at Deloitte. On the other hand, she said, “You can be with a company a long time and not be highly committed.”

Ms. Benko has seen her company shift its ____________ to employees’ level of engagement - or “the level at which people are motivated to deliver their best work” - rather than length of tenure.

Then there are the effects of the recent recession. Many people - if they haven’t been ____________- have stayed in jobs because they feel they have no choice. Employers may need to prepare for disruptions and turnover when the job market improves.

If the pendulum(摇摆不定的事态或局面) shifts, how will businesses persuade their best employees to stay? ____________ may do the trick, but not always. Especially with younger people, “you’re not going to buy extra loyalty with extra money,” Ms. Erickson said. ____________, employers need to make jobs more challenging and give workers more creative space, she said.

Loyalty may not be what it once was, but most companies will still be better off with at least a core of people who stay with them across decades.

If loyalty is seen as a ____________ to keep workers of all ages fulfilled, productive and involved, it can continue to be cultivated in the workplace - to the ____________ of both employer and employee.

9 . In the 1966 science-fiction movie One Million Years B. C., the movie characters had a time travel and arrived in an ancient landscape inhabited by dinosaurs and early humans. The movie was low on science and high on fiction: by then dinosaurs were long dead and modern humans were millions of years away.

A more accurate picture of Earth’s inhabitants at the time is now being revealed. In research published in Nature, a team of scientists led by Anders Gotherstrom at the University of Stockholm, and Love Dalen at the Centre for Palaeogenetics (古遗传学), also in Sweden, describe sequencing (测序) DNA samples from mammoths (猛犸象) that lived and died in north-eastern Siberia around a million years ago.

The team’s work represents a new record, for their mammoth DNA is, by some half a million years, the oldest ever successfully reconstructed. Extracted (提取) from horses, bears and even Neanderthals and Denisovans, two close cousins of modern humans, such ancient DNA has proved an invaluable tool for investigating the past. Although fossils preserve the basic physical features of extinct animals, they are silent about many crucial details that even an incomplete genome (基因组) can help to fill in.

The trouble with DNA is that it breaks down after death. The more broken down it is, the harder it is to sequence. Scientists think that, after about 6m years, all that would be left would be individual base pairs (碱基对), the equivalent of trying to reconstruct a book from several letters. Under the right conditions, however, such as the extreme cold of Arctic permafrost (冻土层) this decay can be slowed.

Dr. Dalen and his colleagues were interested in three mammoth molars (臼齿) extracted in the 1970s from Siberian geological layers that suggested great age. Samples from each were sent to Dr. Dalen’s laboratory in 2017. Having checked they had not been contaminated by bacteria or the shaking hands of Paleontologists, the DNA were extracted, sequenced, and dated. Whereas DNA samples from a living animal can run to several hundreds of thousands of letters, the ancient mammoth samples yielded merely dozens of letter long. This is close to the limit of what is scientifically usable, says a biologist named Ludovic Orlando.