题目

I can’t go swimming because I ________my leg.A. broke          B. had broken         C. have broken       D. have been broken 答案：C下列说法不正确的是（ ）A.麦芽糖及其水解产物均能发生银镜反应B.塑料、合成纤维和合成橡胶被称为“三大合成材料”C.用甘氨酸(H2N-CH2-COOH)和苯丙氨酸()缩合最多可形成4种二肽D.在酸性条件下，CH3CO18OC2H5的水解产物是CH3CO18OH和C2H5OH