单项选择题
某女，60岁，缓慢起病，常有乏力、面色苍白、口腔黏膜萎缩、食欲不振，检查可见对称性的远端肢体麻木、深感觉障碍，血象呈大细胞性贫血，血清叶酸<6.8nml/L。患者平素喜吃软食，无其他疾病。
该患者的应诊断为
A．慢性病性贫血
B．缺铁性贫血
C．巨幼红细胞贫血
D．海洋性贫血
E．合并高黏滞血症的贫血
- A.8nml/L。患者平素喜吃软食，无其他疾病。
该患者的应诊断为
A．慢性病性贫血
B．缺铁性贫血
C．巨幼红细胞贫血
D．海洋性贫血
E．合并高黏滞血症的贫血
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单项选择题
张某，男27岁。近两个月来，忙于成人大专考试复习。3天前右侧期门处赤热作痒，继而作痛，昨日痛增，难以入寐，烦躁口苦。检查：皮肤带状红疹，间有数个小疱疹。舌红，脉弦数。可能的疾病是：
A.湿疹
B．牛皮癣
C．丹毒
D．蛇丹
E．风疹 -
单项选择题
Ruining the Ruins Acid rain (酸雨) is now a familiar problem in the industrialized countries in Europe.Harmful gases are produced by power stations and cars. They dissolve in rainwater and this makes acid rain, which damages trees, rivers and streams.Acid rain is also capable of dissolving some rocks, and buildings made of soft rock,such as limestone(石灰石),are particularly badly affecteD．The acid rain attacks the rock,and so carvings and statues are eroded(受腐蚀)more quickly. __________(46) .According to a report in the New Scientist, acid rain is being blamed for the rapid decay of ancient ruins in Mexico. The old limestone buildings in places like Chichen Itza, Tulum and Palenque are wearing away very quickly indeed.These sites are the remains of the buildings built by the Mayas between 250 BC and AD 900,and the spectacular ruins of Mayan civilization are visited by thousands of touristsevery year.But those ruins are in danger of being seriously damaged by pollution. At many sites the stone has been covered with a layer of black substance. __________ (47) Scientists estimate that about one millimeter of stone is worn away every twelve years. __________ (48) The acid rain is said to be caused by pollution from oil wells in the Gulf of Mexico. Car exhaust Oases are also a problem. Local volcanic eruptions make the problem even worse. Nevertheless, with enough money and effort, researchers say that many of the problems could be solved and the rate of erosion reduceD．__________ (49).Mexico's current lack of funds is also partly due to oil. The country has rich oil fields and a few years ago, when oil was expensive, Mexico was selling large quantities of oil to the USA and earning a lot of money. __________ (50) However, the price of oil then dropped, and Mexico has been left owing enormous sums of money and with not enough income from oil sales to pay back the loans. So unless the price of oil rises, it is unlikely that Mexico will be able to afford to clean up the pollution and save its Mayan ruins from destruction. A．At others the painted surfaces inside temples are lifting and flaking off(剥落)and the stone is being eaten away.B．That is enough to have caused some of the ancient carvings to become seriously damaged already.C．These measures would reduce the pollution, but would not stop it completely.D．The government was therefore able to borrow huge sums of money from banks around the world, thinking they would have no problem repaying their debts.E．The problem, however, is not just a European one.F．However, the Mexican government does not have enough money to do the work,and needs to spend what money it has on the Mexican people. 第 46 题 请选择（46）处的最佳答案．
A.Harmful
B.
Acid
C.The
D.According
E.These
F.
But
G.__________
H.
Mexico's
I.At
J.
B．That
K.
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E．The
N.
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O. -
单项选择题
Earth's Inner Core Scientists have' long struggled to understand What lies at the planet's center. Direct observation of its center is impossible, so researchers must ___________ (51) to other evidence.In 1889, a German scientistdetected a severe earthquake in Japan. Geophysicists concluded that shock waves___________ (52) jolts(晃动) from one side of Earth through the center to the other side. Then in 1936, Danish geophysicist Inge Lehmann studied the waves'___________ (53) to determine that within Earth's core of molten (熔化了的)iron lies a solid inner core-- But___________ (54) that core was made of eluded (难倒)her, Other geophysicists quickly determined that Lehmann's inner core was composed mostly ___________ (55) iron. Since then, Lehmann's discovery has ___________ (56)conventional Earth science.But now scientists are challenging traditional theory with new and radical___________ (57). For example, Earth's center could actually contain an 'inner core within the inner core,' claim Ishii and colleague Adam Dziewonski.Analyzing hundreds of thousands of earthquake wave___________ (58), they maintain that the inner core has at its heart a tiny, even more solid sphere(球体). This sphere 'may be the oldest fossil ___________ (59) from the formation of Earth,' says Dziewonski.Dziewonski and Ishii speculate that shortly___________ (60) Earth formed around 4.8 billion years ago, a giant asteroid (小行星) smashed into the young planet and nearly melted it. But Earth's center didn't quite melt; it___________ (61) mass as the planet cooled. The core within a core may B．e the kernel (核心) that endured. 'Its presence could change our basic ideas about the___________ (62) of the planet,' Dziewonski says.Dziewonski's idea is tame (温和的) compared to the ___________ (63) theories of independent geophysicist J. Marvin Herndon. Earth's inner core is made not of iron, he claims, but a ___________ (64) of nickel and silicon. Herndon has a truly revolutionary notion: Within the nickel silicide(硅化物) inner core is also.an 'inner' inner core -- an 8 kmowide ball of the element uranium. Uranium is radioactive. Herndon thinks the uranium releases heat energy as its atoms ___________ (65) fission-split and crash into one another in a chain reaction. In other words, we may live on top of a gigantic, 'natural'nuclear power plant. 第 51 题A．try B．leave C．turnD．point
A.
In
B.
But
C.
Analyzing
D.
Dziewonski
E.8
F.e
G.
Dziewonski's
H.an
I.try
J.leave
K.turn
D．point
