街心花园的花坛是一个长19米、宽6米的长方形，围着花坛走4圈，要走多少米？
（19+6）×2×4，
=25×8，
=200（米）；
答：要走200米．
The reason ________ she gave for not being present was ________ the heavy snow prevented her coming.
A．why; because
B．why; whether
C．that; that
D．how; that
蚕用（）爬行，蚕身体两侧的小黑点是（），是用来（）的。
