题目

—Have you heard of the new film,Charlotte’s Troubles?         —Yeah,I went to the movies___the film showed up in tour city.         A. unless   B.though    C. until   D.as soon as 答案：D下列符号中，既能表示氢元素，又能表示氢原子的是   A. 2H        B.  2H+          C. 2H2            D.  H