题目

--Mum, I’ve signed for the box. What’s in it?    ---I’m not sure. It _____ be a present from your uncle.  A. need                       B. must                 C. may                  D. will 答案：C如图所示，用150块黑、白两种颜色的立方体相间拼成一个长方体，那么露在表面的黑色立方体共有 块．