题目内容

下列哪项不是雾凇的形成条件？

A. 气温低
B. 水分充足
C. 辐射降温强
D. 风力强劲

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If unemplyment contines to rise, social stability may be ___________.

A. dangerous
B. perilous
C. endangered
D. desperate

A patriot thinks first of his country and later of himself.

A. president
B. hero
C. nationalist
D. soldier

A polite person endeavours to please others.

A. civil
B. common
C. prominent
D. hospitable

肿瘤的生长速度主要取决于

A. 瘤细胞的分化成熟程度
B. 组织来源
C. 瘤组织有无坏死
D. 瘤组织有无出血