The shelves in most supermarkets are full of family-size this and multi-buy that. However, if you’re shopping for one, buying extra     1     (benefit) from price reductions doesn’t make sense. Either your shopping is then too heavy to carry home     2     you can’t use what you’ve bought while it’s still fresh.

Of course, shops are not charities — they price goods in the way     3     will make them the most money. If most of their customers are happy to buy larger quantities, that’s     4     they’ll promote. But that leaves the solo (单独) customers out of pocket and disappointed.

Many supermarkets are no longer doing “buy one get one free” promotions because of the     5     (criticize) that they lead to waste. Consumers prefer money off individual items. However, though it’s nice to get a few cents off a pack of sausages, it would help even more if they could sometimes     6     (offer) in smaller packs. Even the biggest sausage fan doesn’t want to eat them every day.

If your supermarket sells loose produce, then buying smaller quantities is easier. Over the last two years, some supermarkets     7     (start) selling chicken or salad in packs     8     (design) with two halves containing separate portions (份). Then, when you use one section,     9     other stays fresh.

Who knows, perhaps some of the more forward-looking     10     (one) may yet come out with a whole range of “just for you” pack sizes with special offers as well.

To understand a painting, we’re taught to look for color, composition, and light. But how can a painting     1     (appreciate)by someone who’s blind? Through touch, the one thing gallery signs tell you not     2     (do). John Olson, a former     3     (photograph)and his team turn paintings into fully textured 3D models.

The tactile(可触知的)paintings work as a way to show art to     4     blind because we don’t see with just Our eyes: We see with our brains. Research in the field of neuroplasticity-the brain’s adaptability-shows that the visual cortex(大脑皮层)is made active by touch. Blind people recognize shapes with their     5     (exist) senses, in a way similar to that of     6     (sight )people, says Ella Striem-Amit, a Harvard scientist.

Luc Gandarias, who’s now thirteen, went blind suddenly     7     age seven. When he felt a 3D version of Leonardo da Vinci’s “Mona Lisa” he     8     (notice)her smile right away. ”I can actually feel what you see when you look at it,” he said.

For Luc, this means     9     (independent). "The feeling of being able to see it     10     to form my opinion is like breaking down another wall as a blind person.”

Kim Cobb, a professor at the Georgia Institute of Technology in Atlanta, is one of a small but growing minority of academics     1     are cutting back on their air travel because of climate change. Travelling to conferences, lectures, workshops, and the like frequently by plane       2    （view） as important for scientists to get together and exchange information. But Cobb and others     3     （be） now questioning that idea pushing conferences to provide more chances to participate remotely, and     4    （change） their personal behavior to do their part in dealing with the climate change crisis. On a website called No Fly Climate Sci, for example,     5    （rough） 200 academics - many of them climate scientists     6     （promise） to fly as little as possible since the effort started two years ago.

Cobb, for her part, started to ask conference organizers who invited her to speak     7     she could do so remotely; about three-quarters of     8     time, they agreed. When the answer, was no, she, declined the     9     （invite）. That approach brought Cobb's air travel last year down by 75%, and she plans     10    （continue） the practice. "It has been fairly rewarding. ", she says, "a really positive change."