题目

右图表示某二倍体生物正在进行分裂的细胞，关于此图的说法正确的是 A．是次级精母细胞，处于减数分裂第二次分裂后期 B．含同源染色体2对、DNA分子4个、染色单体0个 C．正在进行等位基因分离、非等位基因自由组合 D．产生生两个子细胞，仅1个具有生殖功能 答案：D 阅读理解 Mapping Your World 　　Different forms of maps are appearing．They allow independent travelers to get local knowledge of places they are visiting, from the official to the unusual．Meanwhile, hi-tech developments are creating new ways for us to map the world．Here are two of our favorites; Green Maps 　　Green Maps allows people to share with the world their knowledge of environmentally friendly places and attractions in the local areas．Users add information with a set of icons(图标),making　it easy to read any map ,whatever the　nationalities of those who produce it．At present　there are over five hundred　Map projects being developed in 54 countries Green Maps’ advertised idea is “think　global, map local”．It is a wonderful　way of　gaining all sorts of　a place, ranging from community garden to good places of bird watching． 　　Green Maps is not specifically intended for travelers．Not all of its maps are online, so it may be necessary for some users to communicate with producers through the Green Maps website． Maps Mashups 　　Many people use online maps developed by Google, but not many know about the mashups of them．Working in a similar way to Green Maps, Maps Mashups allows people to add icons of their own to existing maps to express a certain topic．The mashups is so called because it combines all the knowledge you could ever need．It ranges from the extremely useful, such as where all the World Heritage Sites are, to the most bizarre(古怪的)，such as where America’s munkest cities are．With the mashups added to the basic Google Maps, a multi-layered(多层的)map can be created． (1) According to the passage, which of the following is a characteristic of Green Maps? [　　] A． Aiming at environmental protection． B． Introducing local attractions with icons． C． Offering advice to independent travelers． D． Collecting icons worldwide for local maps． (2) Which of the following icons is most probably NOT used in Green Maps? [　　] A． B． C． D． (3) Map Mashups is named with the word “mashups” because [　　] A． it is produced by users all over the world B． it gathers various kinds of information C． it shares icons with Green Maps D． it is a branch of Google Maps (4) What do Green Maps and Map Mashups have in common? [　　] A． They are created by local people． B． They are environmentally friendly． C． Users can edit maps on the Internet． D． Users need to communicate with produces．