有关碳酸锂中毒的描述，以下哪项不对（） A.肾脏疾病的影响 B.监测脑电图对于临床诊

（2分）溶液在生产和科研中具有广泛的用途，与人们的生活密不可分。

（1）衣服沾有的油污，可用汽油洗去，是因为汽油能   （填“溶解”或“乳化”）油污。

（2）喝了冰镇汽水以后，常常会打嗝，这种现象说明气体的溶解度与        有关。

下列现象或反应的原理解释正确的是

Special trees that grow faster, fight pollution, produce better wood, and even sense chemical attacks are being planted by scientists in the US．

When 40 per cent of Hawaii's US$14 million-a-year papaya （木瓜）industry was destroyed by a virus five years ago, work began on creating genetically engineered（转基因的）trees．

Researchers successfully introduced seeds that were designed to resist the virus．Since then, more and more people have been testing genetically engineered trees．Some researchers put special bacteria into trees to help them grow faster and produce better wood．Others are trying to create trees that can clean polluted soil．Meanwhile fruit farmers are looking for trees that are strong enough to resist worms, and paper companies want trees that produce more wood and therefore more paper．

The Pentagon （五角大楼） even gave the researchers US$500,000 this year after they developed a pine tree that changes its colours if it senses a chemical attack．So far, the poplar, eucalyptus （杨树与桉树）, apple and coffee trees are among those being engineered．All this can be done today because we have a better understanding of tree genomes （基因组）．

However, some people fear that the genetically engineered trees will cause dangerous results．They are worried that the new trees will breed with natural species and change the balance of the forest environment．

“It could be destructive,” said Jim Diamond, an environmentalist. “Trees are what is left of our natural environment and home to many endangered species.”

But researchers insist that science could give nature a fighting chance against both natural and man-made dangers．They hope to answer the critics by stopping the new trees from breeding, so their effect on the environment can be controlled．

63．Which kind of tree is not the ones that scientists are planting in the US?

A．Trees that worms can't hurt．

B．Genetically engineered trees．

C．Trees that can resist wind better．

D．Trees that can protect themselves at a chemical attack．

64．What caused the American scientists to work on special trees?

A．Tree genomes are mapped out so scientists know how to improve trees．

B．Great numbers of trees have been lost due to attacks by viruses．

C．Researchers successfully introduced seeds designed to resist the virus．

D．They think science could give nature a fighting chance against both natural and man-made dangers．

65．Which of the following was probably the first kind of trees being engineered?

A．Papaya．                     B．Pine．                          C．Apple．                        D．Poplar．

66．Why did critics think engineered trees dangerous? Because ________．

A．these trees can destroy the balance of nature

B．everything except trees has been genetically engineered

C．trees are home to many endangered species

D．these trees may affect normal trees

6个钉子_呻、Q、R、s、T和u放在7个不同的洞中，每一个钉子所占据的洞与其他钉子的不一样。这些洞按从左到右的顺序从1到7编号，且一条直线均匀分布。钉子的放置仅须遵从以下条件：(1)P和Q之间的距离与R和S之间的距离相同；(2)T和U相邻，但先后位置不一定；(3)最左边的那个洞不能空着。

下面哪一项对钉子从l到7的排列与题目中所给出的条件相一致

A．Q、空、P、T、U、S、R

B．Q、R、空、S、P、U、T

C．S、T、Q、R、U、空、P

D．S、R、U、T、P、Q、空

小规模纳税人取得了增值税专用发票的，该税款可以抵扣。( )