西湖龙井“老火糙米色”主要原因是()
A、早春气温低又早采
B、茶园遮荫
C、高温辉锅
D、夏秋茶转制龙井
参考答案:C
8. He was so deep in thought, thinking of the problem ______ he knocked into the tree without noticing it.
A.when
B.while
C.because
D.That
不同层次和种类的规范类文书,其制发权限不得越权制发,这反映了规范类文书的()。