阅读以下文字，完成以下问题。 土壤、水、阳光和空气是大自然赋予人类和其他生物生存的四大要素。一般

下列说法，不符合原文意思的一项是()。

A．土壤是大自然赋予人类和其他生物生存的四大要素之一

B．土壤被污染后，有害物质被植物吸收，然后被动物吃进去，我们就吃到了有毒的蔬菜、水果和肉类了

C．土壤污染导致大气污染、地表水污染、地下水污染等其他环境问题

D．我国大多数城市近郊土壤都受到了不同程度的污染

对第四段文意的分析概括，恰当的一项是()。

A．加强对工业“三废”的治理，就能控制和消除土壤污染源

B．治理土壤污染的方法一共有消除土壤污染源、增施有机肥等四种

C．在所有治理土壤污染的方法中，采用一些特殊的物理或化学手段来除污最为重要

D．治理土壤污染，控制、消除土壤污染源和采取防治措施必须兼顾

根据原文信息，以下推断不正确的一项是()。

A．土壤和水、阳光、空气一样，是人类赖以生存的要素条件之一

B．土壤污染很大程度上是由人类自身导致的

C．土壤污染一般都看不见，而且引起的不良后果要在很长时间以后才能显现出来。所以，人们根本不会注意到自己脚下的土地正遭受着严重的污染

D．土壤污染给我国造成了严重的经济损失

文中[ ]应填入的词语是()。

A．清除

B．铲除

C．除掉

D．去除

Which country is the biggest consumer of petroleum？

A．The United States.

B．Russia.

C．Norway.

D．Venezuela.

A．reliable

B．trustworthy

C．dependent

D．grand

Why do boys and girls in co-education have no illusion about each other？

A．They live together and know each other too well.

B．Years of living together at school dismiss such illusions.

C．Co-education encourages them to have an healthy attitude toward life.

D．They are familiar with each other's problems.

We can infer from the passage that some parents send their children to receive education other than co-education, because______.

A．Parents worry about their children's safety

B．Parents are afraid of their children's being involved in love affairs at an early age

C．Parents think that these schools are perfect

D．Parents hope that their children can acquire as much knowledge as possible

In the angry debate over how much of IQ comes from the genes that children inherit from parents and how much comes from experiences, one little fact gets overlooked: no one has identified any genes (other than those that cause retardation) that affect intelligence. So researchers led by Robert Plomin of London's Institute of Psychiatry decided to look for some:

Plomin's colleagues drew blood from two groups of 51 children each. They are all White living in six counties around Cleveland. In one group, the average IQ is 136. In the other group, the average IQ is 103. Isolating the blood cells, the researchers then examined each child's chromosome 6 (One of the 23 human chromosomes). Of the 37 land marks on chromosome 6 that the researchers looked for, one jumped out: a form. of gene called IGF2R occurred in twice as many children in high IQ group as in the average growth—32 percent versus 16 percent. The study concludes that it is this form. of the IGF2R gene, called allele 5, that contributes to intelligence.

Plomin cautions that "This is not a genius gene. It is one of many". (About half the differences in intelligence between one person and another are thought to reflect different genes, and half reflect different life experiences.)The gene accounts for no more than four extra IQ points. And it is neither necessary nor sufficient for high IQ: 23 percent of the average-IQ kids did have it, but 54 percent of genius kids did not.

The smart gene is known by the snappy name "insulin like growth factor 2 receptor" (IGH2R to its fun). It lets hormones like one similar to insulin dock with cells. Although a gene involved with insulin is not the most obvious candidate for an IQ gene, new evidence suggests it might indeed play the role. Sometimes when s hormone docks with the cell, it makes the cell grow; sometimes it makes the cell commit suicide. Both responses could choreograph the development of the brain. Scientists at the National Institutes of Health find that insulin can stimulate nerves to grow. And in rat brains, regions involved in learning and memory are chock full of insulin receptors.

Even though this supports the idea that IGF2R can affect the brain and hence intelligence, some geneticists see major problems with the IQ-gene study. One is the possibility that Plomin's group fell for what's called the chopsticks fallacy. Geneticists might think they've found a gene for chopsticks dexterity, but all they've really found is a gene more common in Asians than, say, Africans. Similarly, Plomin's IQ gene might simply be one that is more common in groups that emphasize academic achievement. "What if the gene they've found reflects ethnicity？" asks geneticist Andrew Feinberg of Johns Hopkins University. "I would take these findings with a whole box of salt".

As for how much of IQ comes from the genes and how much come from experiences,______.

A．scientists have reached an agreement

B．scientists' opinions vary

C．no genes have ever been identified

D．scientists have found many smart genes

A healthy person has______. chromosomes all together.

A．6

B．23

C．37

D．46