单项选择题


Passage Three
Questions 33 to 35 are based on the passage you have just heard.

A．Ozone as a form of oxygen.
B．Problems caused by the thinning of the ozone layer.
C．The origin of ozone problems.
D．The latest studies of ozone problems.
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单项选择题
A．He works at the meat counter.B．He delivers groceries to customers.C．He serves as a cashier.D．He stocks shelves.
A．He works at the meat counter.
B．He delivers groceries to customers.
C．He serves as a cashier.
D．He stocks shelves.
单项选择题
A．They like to stay longer to make more friends on the boat.B．They want to have enough time to rest on the boat.C．They don’t want to go to work earlier.D．They think high-speed boats are dangerous.
A．They like to stay longer to make more friends on the boat.
B．They want to have enough time to rest on the boat.
C．They don’t want to go to work earlier.
D．They think high-speed boats are dangerous.
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