单项选择题

The United States court system is characterized by ______ hierarchies: there are both state and federal courts.

A．double
B．complex
C．simple
D．dual
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单项选择题
Cigarette smoking is a great health ______ and may lead to fatal diseases.
A．opposition
B．protagonist
C．fault
D．hazard
单项选择题
Cosmic rays of various kinds come through the air from outer space, but enormous quantities of radiation from the sun are ______ off.
A．avoided
B．excluded
C．screened
D．separated
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