单项选择题

Are some people born clever, and others born stupid Or is intelligence (67) by our environment and our experiences (68) , the answer to both these questions is yes. (69) our intelligence is given at birth, and no amount of special education can make a genius (70) a child born with low intelligence. (71) , a child who lives in a boring environment will (72) his intelligence less than one who lives in a rich and (73) surroundings. Thus, the (74) of a person’s intelligence are fixed at birth, but (75) those limits will depend on his environment. This view, now (76) by most experts, can be supported (77) .
It is easy to show that intelligence is to a certain degree (78) we are born with. (79) the blood relationship (80) two people, the closer they are (81) to be in intelligence. Thus if we take two unrelated people (82) from the population, it is likely that their degrees of intelligence (83) completely different. If on the other hand we take two (84) twins, they will be very likely to be (85) each other. Relations (86) brothers and sisters, parents and children, usually have similar intelligence, and this clearly suggests that intelligence depends on birth.
A. To some extents B. To some extent
C. To some extend D. In some degrees