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【单选题】
烯烃的官能团是A.
碳碳单键
B.
碳碳双键
C.
碳碳三键
D.
都不对
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【简答题】The heart is an important organ of circulation _________ function is to pump blood to all parts of the body. A) which B) whose C) of it D) its
【单选题】With the flowers ______ everywhere, the park looks beautiful.
A.
to bloom
B.
blooming
C.
be blooming
D.
to be blooming
【简答题】CPR is cardiopulmonary resuscitation (心肺复苏). It forces air into the lungs and pumps(用泵抽) blood and oxygen to the brain in order to increase the chances that a person whose heart stops will survive. It...
【简答题】If a diver suces too quickly, he may suffer the bends. Nitrogen (氮) dissolved (溶解) in his blood is suddenly liberated by the reduction of pressure. The consequence, if the bubbles (气泡) accumulate i...
【单选题】听力原文：As I walked into this old haunted house, I heard this terrible scream and my blood ran cold when I saw this figure in white rushing straight at me. What does the speaker mean?
A.
He was nearly killed by someone.
B.
He saw a ghost in the house.
C.
He was scared out of his wits.
D.
He saw a man rushing at him.
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