思考与探究 I.单项选择。 D )1.Turn the cake and cover it with cream. A.down B.down upside C.upside D.upside down C )2.Our silk is good quality. A.known as B.known by C.known for D.known of 导航页导航页 思考与探究 Ⅰ.单项选择。 ( )1.Turn the cake and cover it with cream. A. down B. down upside C. upside D. upside down ( )2.Our silk is good quality. A. known as B. known by C. known for D. known of D C