Mike is teaching me how a computer.
A:use
B:used
C:using
D:to use
青少年正处于生长发育的关键时期,下列饮食中正确的是( )
写出如图的符合下列条件的角.(图中所有的角均指小于平角的角).
(1)能用一个大写字母表示的角;
(2)以点A为顶点的角.
— What time shall we leave for the airport? — It's foggy today. I'm not sure __________ be closed soon. Let's go now.