Are some people born clever, and others born stupid? Or is intelligence developed by our environment and our experience? Strangely enough, the answer to these questions is yes. To some extent our intelligence is given to us at birth, and no amount of special education can make a genius out of a child born with low intelligence. On the other hand, a child who lives in a boring environment will develop his intelligence less than one who lives in rich and varied surroundings. Thus the limits of person’s intelligence are fixed at birth, but whether or not he reaches those limits will depend on his environment. This view, now held by most experts, can be supported in a number of ways.
It is easy to show that intelligence is to some extent something we are born with. The closer the blood relationship between two people, the closer they are likely to be intelligence. Thus if we take two unrelated people at random from population, it is likely that their degree of intelligence will be completely different. If on the other hand we take two identical twins, they will very probably be as intelligent as each other. Relations like brothers and sisters, parents and children, usually have similar intelligence, and this clearly suggests that intelligence depends on birth.
Imagine now that we take two identical twins and put them in different environments. We might send one, for example, to a university and the other to a factory where the work is boring. We would soon find differences in intelligence developing, and this indicates that environment as well as birth plays a part. This conclusion is also suggested by the fact that people who live in close contact with each other, but who are not related at all are likely to have similar degrees of intelligence.
Which of these sentences best describes the writer’s point in Paragraph 1?

A．To some extent, intelligence is given at birth.

B．Intelligence is developed by the environment.

C．Some people are born clever and others born stupid.

D．Intelligence is fixed at birth, but is developed by the environment.

It is suggested in this passage that ________ .

A．close relation usually have similar intelligence

B．unrelated people are not likely to have different intelligence

C．the closer the blood relationship between people, the more different they are likely to be in intelligence

D．people who live in close contact with each other are not likely to have similar degrees of intelligence

The phrase “ at random” (Line 3, Para.2) means ________ .

A．purposely	B．rationally
C．aimlessly	D．independently

The best title for this article would be ________ .

A．What Does Intelligence Mean?

B．On Intelligence

C．We are Born with Intelligence

D．Environment Plays a Part in Developing Intelligence