单项选择题

Passage Two
Questions 29 to 31 are based on the passage you have just heard.

A．Computers are fast.
B．Computers do not often provide evidences or witnesses.
C．Computers can replace paperwork.
D．Computers are safe from human temptation.
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单项选择题
What is the finding of the 2003 study conducted at Case Western Reserve University
A．About 40 percent of American teens have tried tanning at least once.
B．About 47 percent of white American teens have tried tanning repeatedly.
C．About 47 percent of American teens have tried tanning repeatedly.
D．About 40 percent of white American teens have tried tanning at least once.
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