试管婴儿技术中，受精卵是在试管中形成的，试管的作用相当于女性的（　　）

中国最大沙漠淡水湖红碱淖，近二十年间湖面面积已“缩水”了25. 5平方公里，自2000年以来，红碱淖水体面积下降趋势明显。2011年后，每年减少水体面积在1平方公里内。专家分析，如红碱淖水位继续下降，将使该区域生物链内的动植物受到威胁，同时，红碱淖也很有可能成为“第二个消失的罗布泊”。回答下列问题。

    Qian Xuesen was born in Hangzhou, Zhejiang Province on December 11,1911. After his graduation from Shanghai Jiao Tong University in 1934, he ____(旅行) across the Pacific Ocean to the United States for further study. There he received his degrees. After he graduated, he became a teacher as well as a researcher. He worked ____(努力地) and became a famous scientist.

    He ____(返回) to China in 1955. He played an important role in science in China. He was honored as “The Father of China's Missiles(导弹)”. He is the  ____(骄傲) of the Chinese people. He died on ____(十月) 31, 2009 at the age of 98, but he is a man who ____ (仍然)encourages Chinese young people. His love to his country was expressed in his saying, “My career(事业), my ____(成功) is in China and my destination is in China!” When someone said he could make much more money if he stayed in ____ (美国), he laughed and said, “My family name is Qian, but I don't like qian.”

2015年3月31日凌晨1时35分，世界上最大的太阳能飞机——“阳光动力2号”降落在重庆市江北机场．这架飞机的主要动力是依靠太阳能，不烧一滴油．飞机两翼上装有单晶硅薄膜太阳能电池，比较可靠，能量转化效率约23%，电能利用率达到90%以上，可为四台无刷直流电机提供动力，并在白天给锂电池充电，以满足夜间飞行的能源需求．飞机采用的聚合物锂电池是准固体电液的电池，比较轻．这架飞机比较先进地方还在于，机身整体结构80%是碳纤维，并且是蜂窝状的，不仅质量轻、强度高，而且保温效果比较好．碳纤维材料，还能用来作可穿戴设备的导电元件．穿上这种设备，遇到抢劫等紧急情况，轻按一下衣服上的按钮就能发出求救信号．如果把芯片插在手机里就能监测人体的血糖、血脂，今后还能监测早期癌症．

（1）太阳能电池工作时，是将____ 能转化为____ ．

（2）机身使用碳纤维材料的优点是：____ 

（3）和燃油飞机相比，太阳能飞机的最大优点是____