17.A.A careful analysis biologically  
B.What's globle warming?
C.Solution to the terrifying result
D.Greater danger of extinction 
E.Many shocking things found  F.A shocking report

76.B
The earth is getting warmer.People burn coal,oil and gas and this produces carbon dioxide,methane and nitrous oxide.These gases,called"greenhouse gases",prevent the heat of the sun from leaving the earth's upper atmosphere and this makes the earth warmer.
77.F
A few weeks ago a group of scientists produced a report about global warming and the natural world.They wanted to find out if global warming was dangerous for plants and animals.According to what they found,the scientists say that during the next 50years about 25% of land animals and plants will become extinct.More than a million plant and animal species will be extinct by 2050.
78.C
More than 10% of all plants and animals will become extinct.It is too late to save many plants and animals because of the greenhouse gases that are already in the atmosphere.But the scientists say if we control greenhouse gases now,we could save many more plants and animals from extinction.
79.A
The scientists studied some regions of the world with a very rich biology.These regions were Europe,Australia,Central and South America,and South Africa.Their studies showed that species living in mountainous areas had a better chance of survival because they could move uphill,to get cooler.In flat areas,such as deserts,plants and animals would have to move a very long distance to get cooler,so they are in greater danger of extinction.
80.E
The scientists found that half of the 24 species of butterflies they studied in Australia would soon become extinct.60% of the species in the Kruger National Park in South Africa would also die out,and more than 100% of the 300 South Africa plant species they studied would also become extinct.One of the plants in danger of extinction is the national flower of South Africa,the King Protea.They studied 163 tree species in the Cerrado region of Brazil and found that 70 would become extinct.Many of the plants and trees that live in this region live nowhere else in the world.In Mexico,they studied 1,870 species and found that more than 30% of these were in danger of extinction.
4.A.involve     B.analysis         C.immediately     D.certain     E.worth
F.remarks     G.upset         H.slightly         I.respond     J.note

Why does a woman have the last (and longest) laugh?The answer is that women enjoy a joke more once they get it.If you tell a woman a joke and get a blank look,don't(41)Cdespair.She's just taking her time to understand it.But if the punchline(妙语)does eventually make her laugh it will be(42)Ethe wait.
Scientists have found that while women are slower than men at getting jokes,they enjoy them more when they truly understand.Research shows that women use their brain more than men to process witty(43)Fand have less expectation that they will be funny.
When a joke does hit the right(44)J,however,women derive more pleasure from it.Scientists asked ten men and ten women to look at dozens of black and white cartoons and rate them on a"funniness scale".During the process they underwent sophisticated scans that mapped which parts of their brain were lighting up and timed how long it took them to(45)I to a joke.The women tended to use(46)D parts of their brain.Professor Allan Reiss said:"We found greater activity in the parts of their brain in women,showing women are processing stimuli that(47)Alanguage areas of the brain."
The(48)B of a"feelgood"brain region also revealed that men and women have different attitudes to humour.Experts said:"Women appeared to have less expectation of a reward.So they were more pleased about it."The funnier the cartoon,the more the women's parts of their brain lit up.This was not the case for men.The women took(49)H longer than the men to react to jokes that were funny-but were quicker to spot the"truth".

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