单项选择题

Passage 2
Questions 30 to 32 are based on the passage you have just heard.

A．Place a tax on plastic bags.
B．Start using paper bags.
C．Start using reusable bags.
D．Use biodegradable bags.
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单项选择题
A．They built a much lighter rocket.B．They built a much faster rocket.C．They loaded the rocket with enough fuel.D．They built a multistage rocket.
A．They built a much lighter rocket.
B．They built a much faster rocket.
C．They loaded the rocket with enough fuel.
D．They built a multistage rocket.
单项选择题
The study at the University of California in 2004 made a discovery that ______ .
A．how the brain develops is more important than the size of the brain itself
B．the brain’s total volume had a greater influence on intelligence
C．the physical attributes of the body determine how smart a person is
D．the volume of gray matter in cerebral cortex had a greater influence on intelligence
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