单项选择题

How do we know that the costs are rising in California()

A. It said so in the newspaper.
B. Some people don’t believe it.
C. The governor sent out a press release.
D. A group of people studied the costs of raising a family.

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单项选择题

The brain works much more efficiently when()

A. both sides of the brain are used equally
B. the left side is fully developed
C. scientists work on it
D. the right side is fully developed

单项选择题

One is considered as a color blind man if()

A. he can see the difference between red and deep red
B. he can see the difference between blue and green
C. he can’t tell the difference between orange and green
D. he thinks green is the same as blue