单项选择题

Before she could shout "look （）" to the old man, he was run （）by a car coining from his left.

A. back, on
B. out, over
C. up, down
D. ahead, at

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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
单项选择题
The organization has so far raised $2.5 million to finance bone ______ trans-plants for children.
A. marrow
B. moron
C. mussel
D. mire
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