一个长方形花坛的长是5米,宽是3米,它的周长是______.
C=(a+b)×2
=(5+3)×2
=8×2
=16(米)
答:它的周期是16米.
故答案为:16米.
蚯蚓在玻璃上运动比在硬纸板上运动的速度要慢.______(判断对错)
The little boy is very shy, so he is afraid of _ .[ ]
A. speaking
B. speak
C. to speak