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listening mp3

A. They must endure wear and tear.
B. They must be of the same size.
C. They must be made from a rare material.
D. They must follow some common standards.

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A. They look more traditional.
B. They look more official.
C. They are favored by airlines.
D. They are easily identifiable.

A. For beauty.
B. For variety.
C. For visibility.
D. For security.

A. 急性盆腔炎
B. 原发性痛经
C. 子宫内膜异位症
D. 无排卵性功血

A. 小丁的下腹痛属于原发性痛经
B. 原发性痛经多发于排卵性月经
C. 月经期子宫内膜释放的前列腺素含量增加与原发性痛经有关
D. 应以药物治疗为主，心理精神治疗为辅