2 . Everybody loves a fat pay rise. Yet pleasure at your own can vanish if you learn that a colleague has been given a bigger one. Indeed, if he has a reputation for slacking, you might even be angry. Such behaviour is regarded as “all too human”, with the underlying assumption that other animals would not be capable of this finely developed sense of grievance. But a study by Sarah Brosnan and Frans de Waal of Emory University in Atlanta, Georgia, which has just been published in Nature, suggests that it is all too monkey, as well.

The researchers studied the behaviour of female brown capuchin monkeys. They look cute. They are good-natured, co-cooperative creatures, and they share their food readily. Above all, like their female human counterparts, they tend to pay much closer attention to the value of “goods and services” than males.

Such characteristics make them perfect candidates for Dr. Brosnan’s and Dr. de Waal’s study. The researchers spent two years teaching their monkeys to exchange tokens for food. Normally, the monkeys were happy enough to exchange pieces of rock for slices of cucumber. However, when two monkeys were placed in separate but adjoining chambers, so that each could observe what the other was getting in return for its rock, their behaviour became markedly different.

In the world of capuchins, grapes are luxury goods (and much preferable to cucumbers). So when one monkey was handed a grape in exchange for her token, the second was reluctant to hand hers over for a mere piece of cucumber. And if one received a grape without having to provide her token in exchange at all, the other either tossed her own token at the researcher or out of the chamber, or refused to accept the slice of cucumber. Indeed, the mere presence of a grape in the other chamber (without an actual monkey to eat it) was enough to induce resentment in a female capuchin.

The researchers suggest that capuchin monkeys, like humans, are guided by social emotions. In the wild, they are a co-operative, group-living species. Such co-operation is likely to be stable only when each animal feels it is not being cheated. Feelings of righteous indignation(义愤填膺), it seems, are not the preserve of people alone. Refusing a lesser reward completely makes these feelings abundantly clear to other members of the group. However, whether such a sense of fairness evolved independently in capuchins and humans, or whether it stems from the common ancestor that the species had 35 million years ago, is, as yet, an unanswered question.

3 . Geothermal (地热的) power generation is one of our most stable renewable energy resources. Heat generated below the Earth’s surface can provide an almost unlimited supply to power and heat homes. And while geothermal electricity only accounts for around one percent of global generation, that is set to at least triple by 2050.

The Geysers in California is the world’s largest geothermal electricity complex. It produces enough electricity from its 18 power plants for 725,000 homes, totaling 20 percent of the state’s renewable energy. Superheated “dry steam” is channeled from a large sandstone reservoir heated by a large magma chamber (岩浆房) more than four miles beneath the surface.

Heat is captured from its passage through the rock and the heated water converts into electricity. Cooled water is then recycled and pumped back to gather more heat. EGS (enhanced geothermal systems) technologies will open up many more sites for geothermal energy. “You can effectively put a power plant anywhere,” said Will Pettit, director of the Geothermal Resources Council. “All you have to do is drill deep enough and you will find hot rock.”     

Most geothermal plants actually use a flash steam technique, where hot water (at 360F or 180C) is drawn up, passed into lower pressure tanks and flashed into steam to power a turbine (涡轮机). Binary cycle (双元循环) plants are the growth technology because they can operate at lower water temperatures and more diverse geographical locations. They use moderately hot water to heat a secondary fluid with a lower boiling point—as low as 135F—to drive turbines.

Geothermal plants already emit 11 times less carbon dioxide per unit of electricity than the average US coal power plant. They can also operate 24 hours a day to provide a solid base load for homes and businesses.

There are drawbacks too. Seismic activity around drilling wells is a factor. High investment costs are another. But the US government is backing the sector with multi-million dollar funds to push forward advanced EGS research. Geothermal energy is set to play a big part in the low-carbon electricity future.

4 . It was 1:20 a. m. I had just gone to bed, a bit _________ after celebrating my 31st birthday. Before dinner, I’d placed _________ outside my garden door and prepared the cell phone just _________. After all, it had been _________ that week, resulting in flood warnings.

I was awakened by the _________ of rushing water. When I swung my legs off the bed, I was shocked to feel cold water already up to my knees and _________ fast.

Shaking in darkness, I _________ my phone and turned on its flashlight. Then by the light I could _________ water was from the garden door. It must have breached (在……上) the sandbags. The river, usually such a quiet, slow moving river in my region, had _________ burst its banks. And now I had to __________!

I took __________ action. Any effects of the alcohol before sleep were gone;__________ sobers (使清醒) one up. After I went outside, I learned the river had flooded the neighbourhood. Therefore, if I had woken up just a few minutes later, I would have drowned.

In the end, I think the experience made me __________ and determined to live each day to its fullest. I came very close to drowning that day. But rather than dwell on (沉湎于)what happened, I prefer to __________ what my mother told me afterwards, “Don’t remember the day when you lost everything. Remember the day you __________. That day marked the beginning of a new chapter in your life.”