题目

不是解决我国水资源时空分布不均的有效方法是（    ） Ａ．跨流域调水        Ｂ．兴建水库       Ｃ．节约用水       Ｄ．防治水灾 答案：       Ｄ Helen had to shout ______ above the sound of the music. A. making herself hear      B. to make herself hear  C. making herself heard     D. to make herself heard