As your textbook explains, speeches of introduction usually should be two to three minutes long.
A.
正确
B.
错误
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【单选题】Underground Coal Fires A Looming Catastrophe Coal burning deep underground in China, India and Indonesia is threatening the environment and human life, scientists have warned. These large-scale underg...
A.
underground, fires loom large in the forests
B.
coal burning deep underground is found in China
C.
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D.
arsenic and mercury are the most poisonous elements to water sources