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Today， sustainable development is a proper trend in many countries. According to a recent study， the global market for low-carbon energy will become three times bigger over the next decade. China， for example， has set its mind on leading that market， hoping to seize chances in the new round of the global energy revolution. It is now trying hard to make full use of wind and solar energy， and is spending a huge amount of money making electric cars and high-speed trains. In addition， we are also seeing great growth in the global markets for sustainable products such as palm oil (棕榈油)， which is produced without cutting down valuable rainforest. In recent years the markets for sustainable products have grown by more than 50%.
Governments can fully develop the potential of these new markets. First， they can set high targets for reducing carbon emissions (排放) and targets for saving and reusing energy. Besides， stronger arrangement of public resources like forests can also help to speed up the development. Finally， governments can avoid the huge expenses that are taking us in the wrong direction， and redirecting some of those expenses can accelerate the change from the traditional model to a sustainable one.
The major challenge of this century is to find ways to meet the needs of a growing population within the limits of this single planet. That is no small task， but it offers abundant new chances for sustainable product industries.
51．The traditional business model is harmful because of all the following EXCEPT that ______.
A．it makes the world warmer B．it makes growth hard to continue
C．it brings severe damage to forests D．it consumes natural resources
52．What can we infer from Paragraph 2?
A．High-speed trains are a low-carbon development.
B．China is the leader of the low-carbon market.
C．China lacks wind and solar energy.
D．Palm oil is made at the cost of valuable forests.
53．To fully develop the low-carbon markets， government can ______.
A．cut public expenses B．encourage energy conservation
C．develop public resources D．forbid carbon emission
54．We can learn from the last paragraph that businesses have many chances to ______.
A．make full use of natural resources B．explore new natural resources
C．develop sustainable products D．deal with the major challenge
55．What is the main purpose of the passage?
A．To introduce a new business model. B．To advocate sustainable development.
C．To predict a change of the global market. D．To compare two business models.
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Psychiatrists who work with older parents say that maturity (成熟) can be an asset（资产） in child rearing --- older parents are more thoughtful， use less physical discipline and spend more time with their children. But raising kids takes money and energy. Many older parents find themselves balancing their limited financial resources， declining energy and failing health against the growing demands of an active child. Dying and leaving young children is probably the older parents‘ biggest， and often unspoken， fear. Having late-life children， says an economics professor，often means parents， particularly fathers，“end up retiring much later.”For many， retirement becomes an unobtainable dream.
Henry Metcalf， a 54-year-old journalist， knows it takes money to raise kids. But he‘s also worried that his energy will give out first. Sure， he can still ride bikes with his athletic fifth grader， but he‘s learned that young at heart doesn‘t mean young. Lately he‘s been taking afternoon naps to keep up his energy.“My body is aging，”says Metcalf.“You can‘t get away from that.”
Often， older parents hear the ticking of another kind of biological clock. Therapists who work with middle-aged and older parents say fears about aging are nothing to laugh at.“They worry they‘ll be mistaken for grandparents， or that they‘ll need help getting up out of those little chairs in nursery school，”says Joann Galst， a New York psychologist. But at the core of those little fears there is often a much bigger one:“that they won‘t be alive long enough to support and protect their child，”she says.
Many late-life paren
ts， though， say their children came at just the right time. After marrying late and undergoing years of fertility (受孕) treatment， Marilyn Nolen and her husband Randy， had twins.“We both wanted children，”says Marilyn， who was 55 when she gave birth. The twins have given the couple what they desired for years，“a sense of family.”
Kids of older dads are often smarter， happier and more sociable because their fathers are more involved in their lives.“The dads are older， more mature，”says Dr. Silber，“and more ready to focus on parenting.”
56．Why do psychiatrists regard maturity as an asset in child rearing?
A．Older parents can better balance their resources against children‘s demands.
B．Older parents can take better care of their children.
C．Older parents are often better prepared financially.
D．Older parents are usually mo
re experienced in bringing up their children.
57．What does the author mean by saying ”For many， retirement becomes an unobtainable dream” in paragraph 1?
A．They can‘t obtain the retirement benefits they have dreamed of.
B．They can‘t get full pension unless they work some extra years.
C．They have to go on working beyond their retirement age.
D．They are reluctant to retire when they reach their retirement age.
58．The author gives the example of Henry Metcalf to show that ____________.
A．many people are young in spirit despite their advanced age
B．taking afternoon naps is a good way to maintain energy
C．older parents should exercise more to keep up with their athletic children
D．older parents tend to be concerned ab
out their aging bodies
59．What‘s the biggest fear of older parents according to New York psychologist Joann Galst?
A．Being laughed at by other people. B．Being mistaken for grandparents.
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