A:①②
B:①③
C:①④
D:③④
He lost his bag. Luckily there isn't anything ____ (value) in it.
如图,身高为1.6m的小明想测量一下操场边大树的高度,他沿着树影BA由B到A走去,当走到C点时,他的影子顶端正好与树的影子顶端重合,测得BC=1.4m,CA=0.7m,于是得出树的高度为( )