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问题 单项选择题

毛 * * 曾经指出：“没有五四运动，第一次大革命是没有可能的。五四运动的的确确给第一次大革命准备了舆论，准备了人心，准备了思想，准备了干部。”毛 * * 突出评价的是五四运动（）

A.在文化系统重建中的地位

B.在政党政治方面的作用

C.在民主革命中的作用

D.对中国社会主义运动的意义

答案

参考答案：C

解析：

解答本题的关键是对题干引文的准确解读。题干中毛 * * 强调五四运动为大革命的到来准备了各种条件，而第一次大革命指的是1924--1927年的国民大革命，其性质是资产阶级民主革命，因此B符合题意，排除D；而A和B叙述只涉及到其中一方面且不合题意，排除。故选C。

考点：近代中国的民主革命·五四运动和中 * * 党成立·五四运动在民主革命中的作用

多项选择题

不稳定型心绞痛高危组包括（）

A.静息心绞痛ST段下移<1mm

B.就诊前48Dx时内反复发作

C.静息心绞痛ST段下移>1mm

D.持续时间>20分钟

E.持续时间<20分钟
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问答题

(46)The climatic phenomenon that is being blamed for floods, hurricanes and early snowstorms also deserves credit for encouraging plant growth and helping to control the pollutant linked to global warming, a new study shows.
E1 Nino—the periodic warming of eastern Pacific Ocean waters—causes a burst of plant growth throughout the world, and this removes carbon dioxide from the atmosphere, researchers have found.
(47)The new study shows that natural weather events，such as the brief warming caused by E1 Nino, have a much more dramatic effect than previously believed on how much carbon dioxide is absorbed by plants and how much of the gas is expelled by the soil.
Atmospheric carbon dioxide, or CO2, has been increasing steadily for decades. This is thought to be caused by an expanded use of fossil fuels and by toppling of tropical forests. Scientists have linked the CO2 rise to global warming, a phenomenon known as the greenhouse effect. (48)Alarmed, nations of the world now are drawing up new conservation policies to reduce fossil fuel burning, in hopes of reducing greenhouse gases in the atmosphere.
But David Schimel of the National Center for Atmospheric Research，a co-author of the new study, says that before determining how much to reduce fossil fuel burning we should consider the effects of natural climate variations on the ability of plants to absorb CO2.
Schimel said satellite measurements of CO2, plant growth and temperature show that natural warming events such as E1 Nino at first cause more CO2 to be released into the atmosphere, probably as the result of accelerated decay of dead plant matter in the soil. But later, within two years, there is an explosion of growth in forests and grasslands, which means plants suck more carbon dioxide out of the atmosphere.
" We think that there is a delayed response in vegetation and soil to the warming effects of such phenomena as E1 Nino, and this leads to increased plant growth, " said Schimel.
(49)However, he said, it is not clear whether the warming by E1 Nino causes a net decrease in the buildup of CO2 over the long haul. " We don’t really know that yet, " said Schimel. What the study does show, however, is that the rise and fall of CO2 in the atmosphere is ply influenced by natural changes in global temperature, said B. H. Braswell of the University of New Hampshire, another co-author of the study.
Braswell said that in years when the global weather is cooler than normal, there is a decrease in both the decay of dead plants and in new plant growth. This causes an effect that is the opposite of E1 Nino warming: CO2 atmosphere levels first decline and later increase.
(50) " I think we have demonstrated that the ecosystem has a lot more to do with climate change than was previously believed," said Braswell, " Focusing on the role of human activity in climate change is important, but manmade factors are not the only factors. \
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