黄宗羲言:“有明之无善治,自高皇帝罢丞相始也”。这里的高皇帝是指 [ ]
A.李世民
B.汉武帝
C.朱元璋
D.雍正帝
答案:C
Teachers recommend parents()their children under 12 to ride bicycles to school for safety.
A. not allow
B. do not allow
C. get down to
D. look forward to
试述生态系统的组成以及各组成成分在系统中的作用。