祖国大陆获得统一，各族人民实现了大团结的标志是（    ）

亚洲和北美洲之间的分界线是（　　）

    Many people today like reading stories about UFO.Many people in different countries are studying the UFO.

    There are some different saying for UFO.Among those sayings,the most popular one for UFO is that UFOs are strange creatures(生物) to the earth from other stars.We can call them aliens.

    UFO scientists and many people believed this saying.Some people said that they saw a few UFOs landing on the earth.They seemed to be objects rather like big plates.Some people said that they saw some strange visitors coming out of the UFOs.

    Some people make mistakes when they say they have seen UFOs high in the sky.Perhaps they see a weather balloon or an uncommon plane or the light they see in the sky comes from the ground.Sometimes they see the light from the moon.

    But these are a lot of others we can't understand.It may take many years to find a clear answer and then people will give UFO another name.

农村是中国革命的摇篮，农村是摧毁封建土地制度的阵地，农村是经济体制改革的先锋。下列历史事件中，为开辟由农村包围城市独特革命道路的是（  ）       

某同学在探究“电流跟电压、电阻的关系”时，根据收集到的数据画出了如图9所示的一个图像相符的是   （）