俯视图为圆的立体图形可能是( )．
球，圆柱，圆锥，圆台等．
下列疾病不属于肉芽肿性炎的是
A．风湿病
B．粟粒性结核
C．阿米巴病
D．麻风
E．伤寒
_____ trees are cut down in the forests every year. [ ]
A. Thousand
B. Thousands
C. Thousand of
D. Thousands of
