病历摘要：患者，女性，一周前因跌倒后出现头痛行头颅CT检查示垂体有一微腺瘤，3天后头痛自行缓解，现为进一步检查而来诊。

如果患者服用药物后月经恢复并且规则，突然又出现停经1周，应该最先考虑下列哪种情况？（）

A.怀孕

B.药物用量不足

C.药物用量过大

D.药物失效

E.肿瘤发展

F.并发妇科肿瘤

G.并发妇科非肿瘤性疾病

Which of the following statements is tree about his friend().

A.Writing exhausts his friend.

B.His friend collects a lot of things to write.

C.His friend always has enough material to write on.

D.His friend is doing research to write a paper.