【简答题】胃液的主要成分有哪些? 其中 pH 值最低的成分有何作用?
【单选题】( ) reference refers to the reference where the presupposed occurs in the text before the word or expression that is presupposing.
【判断题】北半球移动性冷高压出现偏南风的部位是西部
【单选题】On no account______ be removed from the library.
【判断题】Cataphoric reference refers to the reference where the presupposed occurs in the text after the word or expression that is presupposing. ()
【单选题】下列哪项新石器时代的考古学文化遗址不属于黄河流域()