—It's 10 minutes' walk.
A:How far
B:How long
C:How often
D:How much
秦始皇说:“天下共苦,战斗不休,以有侯王。赖宗庙,天下初定,又复立国,是树兵也,而求其宁息,岂不难哉。”秦始皇为解决上述问题而采取的措施是( )
—I'm afraid I can't travel with you.—Don't worry. We'll going on vacation until you're better.
设f(x)是定义在R上的奇函数,当x≤0时,f(x)=2x2-x,则f(1)=( )
黄土高原的生态建设采取了哪两个方面的措施?