第20题: [单项选择]The president is often awakened by a noisy crowd which assembles on the White House. A. concentrates B. packs C. squeezes D. gathers 参考答案:D 答案解析:concentrate集中;pack包装;squeeze挤压;gather聚集,收集。因为assemble意为“聚合、组装”,故选D项。
第21题: [单项选择]可疑头盆不称者试产时间为 A. 8~10小时 B. 6~8小时 C. 4~6小时 D. 2~4小时 E. 1~2小时 参考答案:D