单项选择题

Science is still ______ of the causes of many kinds of cancer.

A．ignorant
B．unconscious
C．conscious
D．informed
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单项选择题
Maggie ran back to the kitchen, eggs ______ carefully in her hands.
A．to be held
B．held
C．were held
D．holding
单项选择题
He was in a hurry and left things in a real ______.
A．mixture
B．confusion
C．mess
D．mass
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