题目

A fully-grown blue whale ，_____ 110 feet in height， _____ several tons. A. is measured; weighs                  B. measuring; weighs C. measured; is weighed                 D. measures; is weighed      答案：B如图，菱形ABCD中，∠B=600，AB=4，则以AC为边长的正方形ACEF的周长为（ ）A. 14 B. 15 C. 16 D. 17