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【判断题】
成年牛的食管沟机能完善,通过吸吮可以引起食管沟反射性闭合,A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】Fortunately the leader and all her members were singing from the same ....... sheet.
A.
hymn
B.
prayer
C.
lyric
D.
sermon
【单选题】• A. The house began to leak. • B. Then leaks began in other rooms. • C. Fortunately the rain stopped then and the sun came out. • D. The bad leak started in the living room. • E. It rained steadily f...
A.
C B E A D
B.
D B C E A
C.
E A D B C
D.
B C A E D
【单选题】Fortunately the house was empty when the ________ exploded.
A.
bomb
B.
bum
C.
comb
D.
tomb
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