[单项选择]确定早期妊娠最可靠的辅助方法是( ) A. 测尿中E值 B. 阴道脱落细胞学检查 C. B型超声 D. 妊娠试验 E. 妇科检查
参考答案:C
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第1题: [单项选择]As the group of persons ______ together in a conversational knot, each individual expressed his position in the group by where he stands. A. squeeze B. pack C. pad D. cluster 参考答案:D 答案解析:句意:当一群人集结在一起议事时,他们各自站在自己的立场上阐述自己的观点。cluster作动词时,意为“集结,成群”,符合题意。pad作不及物动词时,意为“轻步慢行”;而pack意为“包装,捆扎”;sq