民工肖像展

北京一个广场自昨日起至周四展出逾二百余幅民工肖像，正是这些神态各异的民工为城市建设立下汗马功劳。图为前日工作人员正在紧张准备民工的黑白照片。

MARS

Mars (IPA: /ˈmɑɹz/ (GenAm); /ˈmɑːz/ (RP)), the fourth planet from the Sun, is sometimes known as the Red Planet because of its reddish appearance as seen from Earth. The planet is named after Mars, the Roman god of war. A terrestrial planet, Mars has a thin atmosphere and surface features reminiscent both of the impact craters of the Moon and the volcanoes, valleys, deserts and polar ice caps of Earth. It is the site of Olympus Mons, the highest known mountain in the solar system, and of Valles Marineris, the largest canyon. In addition to its geographical features, Mars's rotational period and seasonal cycles are likewise similar to those of the Earth.