题目内容：
21-三体综合征属
A．X连锁显性遗传 B．X连锁隐性遗传
C．常染色体畸变
D．常染色体显性遗传
E．常染色体隐性遗传
参考答案：
答案解析：
单选题：21-三体综合征属
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B．X连锁隐性遗传
C．常染色体畸变
D．常染色体显性遗传
E．常染色体隐性遗传
B．X连锁隐性遗传
C．常染色体畸变
D．常染色体显性遗传
E．常染色体隐性遗传
出生时即可能疑为21-三体综合征患儿的特征是
出生时即可能疑为21-三体综合征患儿的特征是A．智能低下 B．母亲髙龄 C．极低出生体重 D．特征性面容 E．多发畸形
请根据短文内容，回答题。Energy and Public LandsThe United States boasts
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