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问题
单项选择题
一孕妇在超声检查时出现眩晕、恶心是由于（）
A.子宫压迫肠道
B.子宫压迫主动脉
C.子宫压迫下腔静脉
D.探头压迫皮肤
E.探头压迫子宫
答案
参考答案：
C
选择题
Would you please keep silent? The weather report _____ and I want to listen.
A. is broadcast
B. is being broadcast
C. has been broadcast
D. had been broadcast
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名词解释
土壤分布的地域性（地方性）规律
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