It with cost you very little to give the boy _____ once in a while; he needs encouragement.
It’s _____; we had better hurry home.
University graduates have an advantage _____ others I getting a job.
脊柱结核最常发生的部位是
A. 横突结核
B. 椎弓结核
C. 颈椎结核
D. 胸椎结核
E. 腰椎结核
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