【单选题】Now let’s watch a clip from this film An Inconvenient Truth, and try to get a global understanding about global warming. After watching the video, choose the best answer to each of the following quest...
【简答题】Someone must get directly across a 160m wide river (from A to B) in the minimum time. The river's current is 0.8m/s, he can row a boat at 1.5m/s, and he can run 3m/s. Try to find the best path he can ...
【简答题】Now let’s watch a clip from this film An Inconvenient Truth, and try to get a global understanding about global warming. After watching the video, choose the best answer to each of the following quest...