题目

After the Arab states won their independence, much attention was paid to developing education, with girls as well as boys ____ to go to school. A. been encouraged       B. encouraged     C. to be encouraged      D. be encouraged   答案：B中国科学院院士张青莲教授主持测定了铕、铱等近十种元素的相对原子质量，为相对原子质量测定作出了卓越贡献，下列关于铕的说法中正确的是（ ）A.原子序数为63B.属于非金属元素C.原子核外电子数为89D.相对原子质量为152.0g