圈：juàn____   quān____   
钻：zuān____   zuàn____  
结：jié____  jiē____

一质点做直线运动，由始点经过t s后的距离为$s=\frac{1}{3}{t}^3-6t^2+32t$，则速度为0的时刻是（   ）

    Mrs. Peters works in a bank. She has two children--Sammy and Annie. Sammy is1  boy. He is seven years old. His sister Annie is four. Sammy goes to the2near his home and studies hard. When Sammy stays at home, he often3games with Annie while Mrs. Peters is busy doing housework. Sammy loves his sister very much and he is usually4to her.5sometimes something unhappy may happen.

    One Saturday morning, Sammy and Annie were playing in the garden. Their mother was cooking. Suddenly Annie began to cry and ran to her mother in the6. Mrs. Peters asked,"  7are you crying, Annie?"

    "Sammy has broken my toy horse," Annie answered, crying8.

    "How did he break it?" her mother asked. Annie9crying, but did not answer for a few seconds. Then she said, "I10him on the head with it." Hearing this, Mrs. Peters understood the whole thing.

2015年7月31日，中国获得2022年冬奥会主办权，这将促进中国冰雪运动的发展．以下关于冰的说法正确的是（　　）