[简答题]

How Green is your orange juice More than a year ago, PepsiCo enlisted Columbia University’s Earth Institute and the environmental-auditing firm Carbon Trust to help assess the carbon footprint of each half gallon of its Tropicana orange juice. The sustainability initiative found that on average the process, from growing the oranges to getting a 64-oz. carton of healthy goodness into your fridge, involved emitting 3.75 Ib. of greenhouse gases. And the single biggest contributor to Tropicana’s carbon footprint wasn’t the gas-guzzling trucks that deliver the cartons to stores or the machinery used to run a modern citrus facility. It was the fertilizer for the orange trees, which accounted for a whopping 35% of the OJ’s overall emissions. That came as a surprise even to the people doing the accounting. "We thought it might be transport or packaging," says Tim Carey, PepsiCo’s sustainability director. "But the agricultural aspects of the op

[单项选择]

W: You look like your father more than your mother.
M: I Prefer to look like my mother.

What does the man mean （　）
A. He thinks his mother looks better than his father does.
B. He thinks his father looks better than his mother does.
C. He loves his mother more than his father.

[单项选择]More than a year has passed since the space shuttle Columbia broke into pieces over central Texas. This past January President Bush announced a long-term program of space exploration that would return human beings to the Moon, and thereafter send them to Mars and beyond. As this magazine (Natural History) goes to press, the twin Mars Exploration Rovers, Spirit and Opportunity, are wowing the scientists and engineers at the rovers’ birthplace--NASA’s Jet Propulsion Laboratory (JPL)--with their skills as robotic field geologists. JPL’s official rover Web site is being stampeded by visitors. The confluence of these and other events resurrects a perennial debate: with two shuttle failures out of 112 missions, and the astronomical expense of the manned space program, can sending people into space be justified, or should robots do the job alone
Modern societies have been sending robots into space since 1957, and people since 1961. Fact is, it’s vastly cheaper to send robots: in most cas
A. A．1) most probably means ______ . hacked severelyB. clicked frequentlyC. closed foreverD. neglected purposely

[填空题]Write NO MORE THAN THREE WORDS.How does the potential sharemate spend his time
A. it varies
B. working from early until late
C. on the Internet

[单项选择]Every year more than half a million American kids have drainage(排泄) tubes surgically implanted in their ears to combat persistent infections. The procedure, known as tympanostomy, may not be as (62) as the tonsillectomy was in the 1940s, but it now (63) as the nation’s leading childhood (64) and a new study suggests it’s being vastly overused. In (65) more than 6,000 scheduled ear tube operations, a team of experts (66) by Harvard pediatrician Lawrence Kleinman found that fewer than half were clearly justified. "Each year", the researchers write in the current Journal of the American Medical Association (JAMA), "several hundred thousand children in the United States may be (67) tympanostomy tubes that offer them no demonstrated (68) ...and may place them at increased (69) ."
Tube placement isn’t a (70) risky procedure, but it costs $1,000 to $1,500 and sometimes scars the eardrum, causing a partial loss of (71)