单项选择题

The best statement of the main idea of this passage is that _________.

A．human brains differ considerably
B．the brain a person is born with is important in determining his intelligence
C．environment is crucial in determining a person's intelligence
D．persons having identical brains will have roughly the same intelligence
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单项选择题
Why is there widespread uneasiness and confusion' about the food situation in Britain
A．The abundant food supply is not expected to last .
B．Britain is importing less food.
C．Despite the abundance, food prices keep rising.
D．Britain will cut back on its production of food.
单项选择题
The main reason for the rise in food prices is that ________.
A．people are buying less food
B．the government is providing less support for agriculture
C．domestic food production has decreased
D．imported food is driving prices higher
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