题目

The message you intend to convey through words may be the exact opposite of _____ others actually understand. A. why         B. that           C. which             D. what   答案：D18．在观察血液的组成的试验中，上层呈淡黄色半透明的液体是血浆，而下层呈深红色的液体是血液中的红细胞．