Why is it difficult for adoptees to find their birth parents?A. They are usually adopted from distant places.B. Their birth information is usually kept secret.C. Their birth parents often try to conceal their birth information.D. Their adoptive parents don ’t want them to know their birth parents.

本题考查对领养制度中信息保密性的理解。关键在于明确领养过程中出生信息的法律保护机制，而非地理位置、个人行为或养父母态度。需抓住“通常”这一关键词，理解制度性保密是普遍现象。

选项分析

A. They are usually adopted from distant places.

错误。领养困难的核心在于信息保密，而非地理距离。即使出生地与居住地较近，保密制度仍会阻碍信息获取。

B. Their birth information is usually kept secret.

正确。许多国家法律规定领养儿童的出生记录为机密文件，未经许可不得公开，导致寻亲困难。

C. Their birth parents often try to conceal their birth information.

错误。亲生父母隐藏信息属于个别现象，而非普遍原因。制度性保密才是主要障碍。

D. Their adoptive parents don’t want them to know their birth parents.

错误。题目问的是“困难”，若养父母配合，可通过法律途径查询。保密制度才是根本阻碍。