两栖动物的生殖和幼体发育必须在水中进行，幼体要经过变态发育才能到陆地上生活。[

根据图画，连线并写一句话。

          乌鸦喝水                                                                                            

           司马光                                                                                                

           四个太阳                                                                                               

              称象                                                                                                      

（）是用来平衡导线拉力或风压的一种电杆加固装置。

A.金具

B.绝缘子

C.横担

D.拉线

______ two giraffes, Zheng He later brought zebras, shells, elephant ivory back to China after his

voyages.[ ]

A. Beside  

B. Except  

C. In addition  

D. Apart from

90°角尺按结构分有整体式和装配式两种。( )

现场心肺复苏时简单有效的人工呼吸法是()

A．仰式人工呼吸法

B．伏式法

C．举腰压背法

D．轩轾板法

E．口对口人工呼吸法