我国的民族区域自治制度是:
①我国处理民族关系的基本原则 ②我国民主制度的重要内容
③我国的基本政治制度 ④我国的基本民族政策
A.①②③④
B.②③④
C.①③④
D.①②③
答案:B
X线胸片双肺透亮度增加,提示()
A.肺气肿
B.肺水肿
C.肺炎
D.肺结核
E.支气管扩张
I think every one should know it will be bad for your health to eat _______ food and take _________ exercise.
A.more, less
B.fewer, more
C.less, less
D.little, much