食品雕刻中的瀑布选用（）制作自然生动。
A.萝卜丝
B.粉丝
C.琼脂
D.粉皮
参考答案：B
The last time we had great fun was _____ we were visiting the Water Park. [ ]
A. where
B. how
C. when
D. why
车辆在高速直线行驶时有噪音，其原因为？（）
A.角齿轮磨损
B.盆型齿轮磨损
C.中心轴承磨损
D.差速小齿轮磨损
