1945年2月，苏、美、英三国政府首脑在苏联的雅尔塔聚会，协调三国对法西斯作战。以下

将下列各句变为被动语态（可以省去动作执行者）.

1. The USA Academy of Motion Picture Arts and Sciences gives Academy Award once a year.

                                                                           _________________________________  

2. They will advance the deadline of completing the project by a month.

                                                                          __________________________________   

3. The repairmen are repairing the damaged bridge now.

                                                                         ___________________________________    

4. At that time the villagers were destroying their forest. 

                                                                      _____________________________________  

5. People have seen a strange creature in the ocean.

                                                                           _________________________________  

抽动障碍主要发病于儿童期，表现为运动肌肉和发声肌肉抽动的疾病。()

以下关于北京城的描述不正确的是（）

A.现在北京城的前身是元大都

B.北京城的特点之一是胡同众多

C.北京的城市建筑围绕中轴线东西对称分布

D.中轴线起于永定门，止于安定门

检测火焰法原子吸收分光光度计的特征浓度常用的代表元素是（）。

A.Zn

B.Mg

C.Cu

D.K

热电缆清蜡适用于什么情况下的油井？