It is the protection for the trees___________ really matters, rather than how many trees are planted. A. what B. that C. 不填 D. which 答案:B 解析: 本题是对强调的用法考查。the protection for the trees是原句的主语,考生一定要仔细区分强调句和定语从句的不同。右图为神经元局部模式图。当人体内兴奋按箭头方向流经该神经元时,在神经纤维内外的电流方向是 A.都是由左向右 B.都是由右向左 C.膜内由左向右,膜外由右向左 D.膜内由右向左,膜外由左向右