下列物质中,能用做抗酸药的是( )
A.氢氧化铝
B.酒精
C.醋酸
D.氢氧化钠
答案:A
–---Dear me! I’ve been in America for a month.
-----________ you are settled, why don’t you take up some serious study ?
A.If
B.Now that
C.When
D.Even if
生态保护的基本原则有哪些?