诊断肺结核的最可靠的依据是()
A.结核中毒症状
B.X线呈浸润性改变
C.结核菌素试验阳性
D.痰找到结核菌
E.血沉增快
参考答案:D
When_________why he was late, he made no answer.
A.questioned
B.questioning
C.asking questions
D.question
学校的操场是一个长200米、宽100米的长方形,如果给操场四周每隔5米栽一棵梧桐树,一共需要栽多少棵?