70. D　主旨大意题。考查对文章整体的归纳理解能力。根据文章第一段The material’s …could provide a more environmentally friendly alternative to plastic.以及后文具体谈论的该材料优于塑料的内容可以推知，选择D符合文意。

　　Brrriiinnng. The alarm clock announces the start of another busy weekday in the morning. You jump out of bed, rush into the shower, into your clothes and out the door with hardly a moment to think. A stressful journey to work gets your blood pressure climbing. Once at the office, you glance through the newspaper with depressing stories or reports of disasters. In that sort of mood, who can get down to work, particularly some creative, original problem­solving work?

　　The way most of us spend our mornings is exactly opposite to the conditions that promote flexible, open­minded thinking. Imaginative ideas are most likely to come to us when we're unfocused. If you are one of those energetic morning people, your most inventive time comes in the early evening when you are relaxed. Sleepy people's lack of focus leads to an increase in creative problem solving. By not giving yourself time to tune_into_your_wandering_mind,_you're missing out on the surprising solutions it may offer.

　　The trip you take to work doesn't help, either. The stress slows down the speed

　　with which signals travel between neurons (神经细胞), making inspirations less likely to occur. And while we all should read a lot about

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