心血管基本中枢位于
A.脊髓
B.延髓
C.中脑
D.丘脑
E.脑桥
参考答案:B
Li Hua's house is very far. She _____ the subway to school every day. [ ]
A. takes
B. take
C. will take
D. by
防火的基本原则是使火源与溶剂尽可能离得远些。