试利用Organic Reaction查:(i)Wittig reaction (ii)Mannich reaction(iii)Cannizaro reaction (iv)Michael reaction (v)aldol condensation.
Soil that is rich in organic matter______.
A.has nothing nutritious added to it
B.is essential for producing fruit and vegetables
C.contains unused vegetable matter
D.has had chemicals and fertilizers added to it
Curiously, some two-and-a-half years and two novels later, my experiment in what the Americans term "down shifting" has turned my tired excuse into an absolute reality. I have been transformed from a passionate advocate of the philosophy of "having it all", preached by Linda Kelsey for the past seven years in the page of She magazine, into a woman who is happy to settle for a bit of everything.
I have discovered, as perhaps Kelsey will after her much-publicized resignation from the editorship of She after a build-up of stress, that abandoning the doctrine of "juggling your life", and making the alternative move into "downshifting" brings with it far greater rewards than financial success and social status. Nothing could persuade me to return to the kind of life Kelsey used to advocate and I once enjoyed: 12-hour working days, pressured deadlines, the fearful strain of office politics and the limitations of being a parent on "quality time".
In America, the move away from juggling to a simpler, less materialistic lifestyle. is a well-established trend. Down shifting—also known in America as "voluntary simplicity"—has, ironically, even bred a new area of what might be termed anti-consumerism. There are a number of best-selling downshifting serf-help books for people who want to simplify their lives; there are newsletters, such as The Tightwad Gazette, that give hundreds of thousands of Americans useful tips on anything from recycling their cling-film to making their own soap; there are even support groups for those who want to achieve the mid-'90s equivalent of dropping out.
While in America the trend started as a reaction to the economic decline—after the mass redundancies caused by downsizing in the late '80s—and is still linked to the politics of thrift, in Britain, at least among the middle-class down shifter of my acquaintance, we have different reasons for seeking to simplify our lives.
For the women of my generation who were urged to keep juggling through the '80s, downshifting in the mid-90s is not so much a search for the mythical good life—growing your own organic vegetables, and risking turning into one—as a personal recognition of your limitations.
Which of the following is true according to Paragraph 1?
A.Full-time employment is a new international trend.
B.The writer was compelled by circumstances to leave her job.
C.A lateral move means stepping out of full-time employment.
D.The writer was only too eager to spend more time with her family.
In asserting that the organic model might be "more serviceable to the restoratioulsts" (Para. 3), the author implies that______.
A.the descriptions by Turner and Jordan of the restorationists program conform. more closely to the organic model than to the community-participation model
B.the organic model is more consistent than the community-participation model with the principle of restoration
C.the organic model is more consistent with the restorationists' agenda than with the preservationists' program
D.holistic models are more useful to the restorationists than is the dualist model
According to the study, organic food is______than conventionally produced food.
A.much healthier
B.better
C.no healthier
D.less healthier
Sales of organic food have fallen because of______.
A.high price
B.economic decline
C.bad service
D.poor quality
What seems confusing or fragmented at first might well become ______ a third time.
A.clean and measurable
B.notable and systematic
C.pure and wholesome
D.clear and organic
Researchers from the London School of Hygiene & Tropical Medicine said consumers were paying higher prices for organic food because of its imagined health benefits, creating a global organic market worth an estimated $48 billion in 2007.
A systematic review of 162 scientific papers published in the scientific literature over the last 50 years, however, found there was no significant difference.
"A small number of differences in nutrient content were found to exist between organically and conventionally (通常) produced foodstuffs, but these have nothing to do with public health, " said Alan Dangour, one of the report's authors.
"Our review indicates that there is currently no evidence to support the selection of organically over conventionally produced foods on the basis of nutritional superiority . "
The results of research, which was commissioned by the British government's Food Standards Agency, were published in the American Journal of Clinical Nutrition.
Sales of organic food have fallen in some markets, including Britain, as a slowdown in economic growth has led consumers to cut back on purchases.
The Soil Association said that growth in sales of organic products in Britain slowed to just 1.7percent, well below the average annual growth rate of 26 percent over the last decade.
Why does organic food cost more than conventionally produced food?
A.Because people think they are much healthier.
B.Because they are more delicious.
C.Because people prefer organic food.
D.Because they sell better.
Farid's reaction to the sceptics' accusations is ______.
A.recognition
B.support
C.denial
D.suspicion