On my way home, I saw a young man with _____ shoulders trying to find out how _____ the river is by walking across it. A. wide; wide B. broad; broad C. broad; wide D. wide; broad 答案:C(07全国卷Ⅰ)某种病菌感染人体并侵入细胞内后,机体可以对该靶细胞产生免疫反应,其中有 A、效应B细胞接触靶细胞,导致靶细胞裂解,从而使病菌抗原被白细胞介素消灭 B、效应B细胞接触靶细胞,导致靶细胞裂解,从而使病菌抗原被抗体消灭 C、效应T细胞接触靶细胞,导致靶细胞裂解,从而使病菌抗原被外毒素消灭 D、效应T细胞接触靶细胞,导致靶细胞裂解,从而使病菌抗原被抗体消灭