The rapid growth of cities worldwide over the next two decades will cause significant risks to people and the global environment, according to analysis.

Researches from Yale and Stanford predict that by 2030 urban areas will expand by 590,000 square miles—nearly the size of Mongolia—to meet the needs of 1.47 billion more people living in urban areas.

“It is likely that these cities are going to be developed in places that are the most biologically diverse,” said Karen Seto, a famous scientist at Yale University. “They are going to be growing and expanding into forests, biological hotspots, savannas(热带稀缺大草原), coastlines—sensitive and vulnerable places.”

Urban areas, they found, have been expanding more rapidly along coasts. “Of all the places for cities to grow, coasts are the most sensitive. People and buildings along the coast are at risk of flooding and other environmental disasters,” said Seto.

The study provides the first estimate of how fast urban areas globally are growing and how fast they may grow in the future. “We know a lot about global patterns of urban population growth, but we know significantly less about how urban areas are changing,” she said. “Changes in land cover associated with urbanization lead to many environmental changes, from habitats loss and agricultural land conversion(转化) to changes in local and regional climate.”

The researchers examined studies that used satellite data to map urban growth and found that from 1970 to 2000 the world’s urban footprint had grown by at least 22,400 square miles—half the size of Ohio.

“This number is numerous, but, in actuality, urban land expansion has been far greater than what our analysis shows because we only looked at the published studies that used satellite data,” said Seto. “We found that 48 of the most populated urban areas have been studied using satellite data, with findings in journals. This means that we’re not tracking the physical expansion of more than half of the world’s largest cities.”

Half of urban land expansion in China is driven by a rising middle class, whereas the size of cities in India and Africa is driven primarily by population growth. “Rising incomes translate into rising demand for bigger homes and more land for urban development, which has a great effect on biodiversity conservations, loss of carbon sinks and energy use.”

51.According to the passage, the most dangerous place for city expansion is the _____.

A. forest           B. desert         C. savannas           D. coastline

52.The underlined word “vulnerable” (in Para. 3) probably means “____”.

A. diverse in plants                               B. beautiful in scenery

C. easily damaged                                        D. very productive

53.From Para. 5, we can infer that ____.

A. urbanization is a good way to improve people’s standards of living

B. cities develop very fast and more and more people come to live in cities

C. more and more agricultural farmlands are used to make room for local animals

D. in the past, researchers focused their attention on the expanding urban areas

54.Cities in Africa become bigger and bigger mainly because of their ____.

A. growing population                                  B. rising middle class

C. unique living patterns                               D. economic development

With your workload growing, you may be telling yourself a vacation is one luxury you can’t afford.  46.  A vacation allows you the opportunity to recharge your physical and motional batteries, disconnect from everyday concerns, and return to work rested and refreshed. Some facts have proved employees are more productive after a vacation than before one. Here are some tips for you to plan your vacation to make sure that your time away from the office is worry free.

Time is right. A Robert Half survey shows that July and August are the most favorable months for employees to take a break because these months offer ideal beach weather and many businesses slow down during this time.  47.  For instance, if a big task is planned for the summer, you may consider postponing your trip until the fall.

Ask others for assistance.  48.  Your supervisor can help you determine who is the most qualified for a particular task.

Let your contacts know. Give colleagues and customers you frequently work with a few weeks’ notice before you start off.  49.

Conduct a technical review. Before you leave, make sure there is plenty of room in your e-mail inbox so you don’t exceed (超越) your storage limit while you’re out of the office, which might prevent you from sending messages when you return.  50

In short, taking vacation is necessary and beneficial for your job. But you must plan your vacation properly in order to work free and worry free on holiday.

A. Ask trusted colleagues to handle your projects while you’re away.

B. A summertime beach vacation includes so much more than what you desire these days.

C. But the truth is that you can’t afford not to take one.

D. This will give them enough time to plan for your absence.

E. Also make sure passwords won’t expire(期满) while you are away.

F. What’s more, find your pet a temporary home when you are on vacation.

G. When planning your vacation, remember to take into account any activity that your department will be focused on during that time.

26.A.hardly                   B.seldom                 C.ever              D.never

27.A.so                          B.but                        C.and                D.then

28.A.Before             B.When                   C.While             D.Since

29.A.something       B.anything           C.everything        D.nothing

30.A.crying              B.running                 C.talking            D.saying

31.A.kept                        B.started                  C.stopped         D.hated

32.A.hurt                       B.ache              C.injure             D.wound

33.A.got                          B.received                  C.accepted       D.admitted

34.A.many                      B.some                    C.any              D.no

35.A.soon                   B.quickly             C.suddenly        D.fast

36.A.surprisingly       B.angrily                C.sadly   D.cheerfully

37.A.building                  B.buying                 C.making          D.repairing

38.A.shouldn’t                B.won’t                     C.daren’t       D.can’t

39.A.polite                      B.cruel               C.rude              D.nice

40.A.get over         B.get away                 C.get along     D.get through

41.A.for                          B.on                         C.by                D.in

42.A.did                          B.followed            C.went            D.worked

43.A.full                          B.incomplete              C.half             D.undivided

44.A.sent out          B.threw out         C.put out            D.poured out

45.A.expressed    B.showed        C.said              D.strengthened

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