[阅读]六月二十七日至七月二十八日阅读寂静汇总（结贴）

Behind

感谢感谢，这个狗狗很重要的~~

kangkangbobo

密码是什么啊

hukeab

阅读的狗狗真的好棒啊~忍不住再赞一个，很详细，标注的也很清楚~楼主和NOWWSY都好强大！

msgmat

第十一篇是不是GWD的GWD-28-Q33-Q36 ？

suade0904

You can tell how old a tree is simply by counting its rings, which reflect the changing seasons. However, things are less straightforward when it comes to tropical trees, since there are no summers and winters to mark the passage of time. Now scientists have worked out a simple way to tell the age of trees from the tropics, according to Nature.

Currently, factors such as the width of tree rings in temperate zones are used to provide a detailed record of climate conditions for the past 1 000 years or so. But only a few types of trees in the tropics have visible rings: the variances between wet and dry seasons are too slight to leave a distinguishable mark.
Until now, scientists have depended on measurements of oxygen and carbon isotopes to determine their age, butPascale Poussart, a geochemist at Princeton University in New Jersey, and her colleagues, have shown that an apparently ring less Miliusa velutina tree from Thailand does have rings... they're just invisible.
Using X-ray beams focused on wood samples, the researchers looked at calcium, a mineral that trees take up during their main growing season. They revealed annual peaks dating back to 1909.Although the results were in line with carbon isotope measurements,(關於新方法，何者是何者是對的) the calcium method is much quicker.

"It took us just one afternoon in the synchrotron to produce the record," (方法最大的優點) says Poussart. "The isotope record cost four months of lab time."



The team doesn't yet know whether seasonal calcium cycles are common, (如何使新方法普遍接受) or if the feature is specific to just a few types of trees. And it is unclear whether periods of drought, or the modest and patchy dry seasons that feature in some areas of the tropics, will make the signal undecipherable.In search of answers, Poussart will be working with scientists at the Smithsonian Tropical Research Institute's Center for Tropical Forest Science, who runs long-term forest monitoring programmers in Africa, Asia and Latin America.

At the moment, much about tropical systems is a mystery, so anything that helps measure time will make an important contribution to the understanding of tropical forest dynamics.



1.主旨題＃提出一個新方法，並說明其有缺陷＃

2.第二段與第一段：新老辦法對比

參考答案：calcium方法沒有炭氧法那麼well-established.

3.下列哪一個是undermine第一段所說"熱帶樹林 is too subtle to 顯示氣候的跡象"?

參考答案：在泰國地區，發現了三種新型態的熱帶樹林，他們的年輪痕跡是用肉眼就可以看出來的

4.下列哪種情況學者會比較支援第二段那個人calcium的方法

參考答案：如果知道季節在哪種情況下會對年輪辨識度影響較大

5.問文章最後一句話（這種collaboration）infer

參考答案：選對此方法需進一步驗證其有效性

6.問從文章可以infer什麼？

參考答案：方法可以測樹的年齡

7.這種方法最大的優點

省時間

8.問關於這個科學家題出的新方法何者正確

答案選C就是他的結果和原始方法得出的結果一致加強了此方法的正確性

ruguokey_20

感激楼主。。。

ruguokey_20

要是我考了个700+。。也来回报做个回报的CDer

ozymendias

You can tell how old a tree is simply by counting its rings, which reflect the changing seasons. However, things are less straightforward when it comes to tropical trees, since there are no summers and winters to mark the passage of time. Now scientists have worked out a simple way to tell the age of trees from the tropics, according to Nature.

Currently, factors such as the width of tree rings in temperate zones are used to provide a detailed record of climate conditions for the past 1 000 years or so. But only a few types of trees in the tropics have visible rings: the variances between wet and dry seasons are too slight to leave a distinguishable mark.
Until now, scientists have depended on measurements of oxygen and carbon isotopes to determine their age, butPascale Poussart, a geochemist at Princeton University in New Jersey, and her colleagues, have shown that an apparently ring less Miliusa velutina tree from Thailand does have rings... they're just invisible.
Using X-ray beams focused on wood samples, the researchers looked at calcium, a mineral that trees take up during their main growing season. They revealed annual peaks dating back to 1909.Although the results were in line with carbon isotope measurements,(關於新方法，何者是何者是對的) the calcium method is much quicker.

"It took us just one afternoon in the synchrotron to produce the record," (方法最大的優點) says Poussart. "The isotope record cost four months of lab time."



The team doesn't yet know whether seasonal calcium cycles are common, (如何使新方法普遍接受) or if the feature is specific to just a few types of trees. And it is unclear whether periods of drought, or the modest and patchy dry seasons that feature in some areas of the tropics, will make the signal undecipherable.In search of answers, Poussart will be working with scientists at the Smithsonian Tropical Research Institute's Center for Tropical Forest Science, who runs long-term forest monitoring programmers in Africa, Asia and Latin America.

At the moment, much about tropical systems is a mystery, so anything that helps measure time will make an important contribution to the understanding of tropical forest dynamics.



1.主旨題＃提出一個新方法，並說明其有缺陷＃

2.第二段與第一段：新老辦法對比

參考答案：calcium方法沒有炭氧法那麼well-established.

3.下列哪一個是undermine第一段所說"熱帶樹林 is too subtle to 顯示氣候的跡象"?

參考答案：在泰國地區，發現了三種新型態的熱帶樹林，他們的年輪痕跡是用肉眼就可以看出來的

4.下列哪種情況學者會比較支援第二段那個人calcium的方法

參考答案：如果知道季節在哪種情況下會對年輪辨識度影響較大

5.問文章最後一句話（這種collaboration）infer

參考答案：選對此方法需進一步驗證其有效性

6.問從文章可以infer什麼？

參考答案：方法可以測樹的年齡

7.這種方法最大的優點

省時間

8.問關於這個科學家題出的新方法何者正確

答案選C就是他的結果和原始方法得出的結果一致加強了此方法的正確性

-- by 会员 suade0904 (2010/7/3 11:28:28)

谢谢suade0904！！！太强大了！

宋宋

每次做RC错得巨沮丧时看看楼主的寂静~~就感觉还有希望了···谢谢你们啦~~辛苦了~~~~~

quianpeng

can not open