More than 243,000 cases were added in the past week, the second-highest number of child cases in a week since the pandemic began. 过去一周全美新增的儿童新冠确诊病例超24.3万...
Chengdu student calls on green travelPhoto: Wang Binglin Chengdu is building a “Park City”, which is very attractive to Wang Zhehan. Especially after the construction of Tianfu Greenway, it provides him with another alternative for bicycling. “R...
- China is self-sufficient in grain supply. In 2018 the grain output was 610 million tons, accounting for more than 90 percent of total food output, and growing by 160 million tons over 1996. Currently China supplies 95 percent of its own needs for...
18. A) It calls for more research funding to catch up. B) It lags behind other disciplines in collaboration. C) It is faced with many unprecedented challenges D) It requires mathematicians to work independently. Questions 19 to 21 are based on the ...
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