单项选择题

Poor health and lack of money may both be to educational progress roadblocks.

A. restraints
B. stains
C. scarcities
D. barriers
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单项选择题
You can turn to different kinds of people, dictionaries or maps, to find out what you wish to know.
A. contact
B. consult
C. refer
D. request
单项选择题
After a day's fierce fighting, the enemy finally had to remove their troops from the occupied are
a.A. retreatB. returnC. dismissD. withdraw
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