题目

Transport has a lot to answer for when it comes to harming the planet. While cars and trains are moving towards greener, electric power, emissions（排放）from air travel are expected to increase massively by 2050. If we want big green sky solutions, we need blue sky thinking. Fortunately, there's plenty of that happening right now, particularly the short - haul flights powered by batteries.Harbour Air is the largest seaplane airline in North America, flying 30,000 commercial flights in 40 seaplanes each year. Significantly, all Harbour Air routes last less than 30 minutes, making it perfec         The world economy has improved _____ since the end of last year, but major problems and challenges are not fully solved.    A. somehow      B. somewhat     C. anyhow          D. meanwhile