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The word "considered" in Paragraph 5 could be best replaced by．
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Crop Problem
Advances in technology have helped more of the world's population live better and longer -- and that is part of our problem!
Better health standards have kept larger number of people alive．The world’s population is now almost four billion and expected to double in twenty-five years．Growing population and slowly rising living standards have increased our need for food at the rate of 30 million tons per year．As a result, the world's stockpile of food (食物储备) is declining by about 10 million tons per year．
From the early I950s until 1972, world food production increased greatly．The GreenRevolution (绿色革命) extended scientific techniques to agriculture in the form. of hybrid seed (杂交种) and poultry(禽类), chemical fertilizers (化学肥料) and pesticides(杀虫剂), and complex irrigation systems．Strains(品种) of corn (玉米), sorghum (高粱), soybeans（大豆）, wheat and rice were developed to flourish under particular climate and soil conditions．
In the United States, corn production rose to 110 bushels (蒲式耳：谷物、水果、蔬菜等容量单位相当于=36 368升,在美国相当于 35 238升) per acre from only 26 bushels per acre in the early 1900s．Milk production rose to 10 000 pounds per cow per year, compared with 600 in India, Chickens were bred to eat less, grow to maturity in shorter time, and produce more eggs．As a result of such scientific advances, our twelve Midwestern states alone now feed one fourth of the world’s people．
Crop disaster in 1972 brought an apparent end to the growth in production．Much of the extra yields had come from the use of chemical fertilizers, primarily petroleum based and now in short supply．The drop in world supplies of petroleum-based fertilizers is expected to cause a drop in crop yields of ten tons for each one ton decline in fertilizers applied．
This presents a particular problem for underdeveloped nations that often lack the foreign exchange necessary for buying fertilizer．The problem is so severe that Philip Handler, president of the National Academy of Sciences, has predicted one million child deaths per month in these nations by the year 2025．
第 41 题 The expected world population will reach______in 25 years．
If a young man proposed to a girl, the girl would ask her father for permission.
Squishy (可挤压的)Cellphones Add a Buzz (振动声) to Calls
Vibrating rubber cellphones could be the next big thing in mobile communication.They allow people to communicate by squishing the phone to transmit __ (1) along with their spoken words． According to a research team at the MIT Media Lab in Cambridge, Massachusetts, the idea will make __ (2) more fun.
Many mobile phones can already be made to vibrate __ (3) ring when you do not want people to know you are getting a call．But these vibrations(振动),__ (4) by a motor spinning an eccentric(离心的，偏轴的) weight inside the device, are too crude for subtle communication, says Angela Chang of the lab's Tangible Media Group．"They are__ (5) on or off," she says.
But when you grip Chang' s prototype (样机) latex (橡胶) cellphone, your fingers and thumb wrap around five __ (6) speakers．They vibrate__ (7) your skin around 250 times per second． Beneath these speakers sit pressure sensors(传感器), so you can transmit vibration as well as __ (8) it．When you squeeze with a finger, a vibration signal is transmitted __ (9) your caller's corresponding finger．Its __ (10) depends on how hard you squeeze.
She says that within a few minutes of being given __ (11) the phones, students
were using the vibration feature to add emphasis to what they were saying or to interrupt the other speaker．Over time, people even began to transmit their __ (12) kind of ad hoc(专门的) "Morse Code" (摩尔斯电码), which they would repeat back to show they were following what the other person was saying． "It was pretty easy to communicate,though we didn't specifically pre-arrange __(13)," says David Milovich, one of the students who tried out the device.
Chang thinks "vibralanguages" could__(14) for the same reason as texting(发短信) : Sometimes people want to communicate something __ (15) everyone nearby knowing what they're saying．"And imagine actually being able to shake someone's hand when you close a business deal," she says.
第 51 题
A．ownB．uniqueC．otherD．different
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