题目内容

D tries to get the hearer to do something.

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There are different types of affixes or morphemes. The affix "ed" in the word "learned" is known as a(n) ______.

A. derivational morpheme
B. free morpheme
C. inflectional morpheme
D. free form

Saussure used ______ to refer to the abstract linguistic system shared by all the members of a speech community.

A. performance
B. parole
C. langue
D. competence

下列符合佝偻病初期主要临床表现的是( )

A. 肋骨串珠
B. 方颅
C. 枕秃
D. 前囟闭合延迟
E. 颅骨软化

1岁的小儿，因夜间睡眠不安、多汗、易激惹就诊。体格检查：有鸡胸、肋膈沟；患儿不能独自站立；血清钙、磷乘积低于正常水平，碱性磷酸酶明显升高；X线摄片显示骨质疏松，确诊为佝偻病激期。该患儿每天口服维生素D治疗的剂量为( )

A. 400一800 U
B. 500—1000 U
C. 1000—2000 U
D. 2000-4000 U
E. 20万一30万U