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在8000年前，地球上大约有61亿公顷森林，近1／2的陆地被森林覆盖，目前，地球上仅存有39亿公顷森林和12亿公顷的稀疏林。被破坏的世界森林面积估计每年在1000万顷以上，许多著名的“森林之国”(如泰国)已名存实亡。早在1977年，泰国已从木材出口国变为木材进口国，泰国呵叻高原葱郁的森林已不复存在，裸露出砖红色的土壤，水土流失十分严重。据此回答1～2题。 小题1:关于上述材料的叙述正确的是 ①世界上的森林面积在不断减少 ②世界上的森林面积没有什么变化 ③世界上森林面积减少造成了全球性的气候变化 ④世界上森林面积减少使水土流失现象十分严重 A．①③ B．②④ C．③④ D．①④ 小题2:在无林地区20cm厚的土层，只需40年就可以冲刷殆尽，而有林地区则需75年以上，这说明了森林具有的作用是 A．净化空气 B．保持水土 C．调节大气成分 D．含蓄水源
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【简答题】请用汉语简要回答下列问题: 1. Health officials in China tracked many of the initial cases to a large seafood market in Wuhan, a city in central China , that also sold wild animals as meat. 问题: 如果将这句话翻译成汉语,划线词语是否需要...
【简答题】Through the use of social media, businesses can get their messages across in a different way from the method they use (in more traditional media) ___________ .They can have more engaging, two-way conv...
【判断题】They wanted to limit the spread of the virus. Here we can also use the word "transmission" to replace the word "spread".
A.
正确
B.
错误
【简答题】They can also spread when a person touches something, such as a door handle which is with droplets and then touches their mouth, nose or eyes.
【简答题】tyle="font-family:'Times New Roman','serif'"> 例 1 Health officials in China tracked many of the initial cases to a large seafood market in Wuhan, a city in central China , that also sold wild animals ...
【简答题】Prions are considered “_________” because they can also spread from an affected individual to a normal individual via contaminated food, blood, or surgical instruments.
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