【单选题】One study shows that Americans prefer to answer with a brief 'Yes', 'No', 'Sure', or the very popular 'Yeah' rather than with a longer reply. But brief replies do not mean Americans are impolite or un...
【简答题】A new study shows one of the largest glaciers①in Greenland is becoming smaller and speeding to the sea faster than scientists expected. If it continues, Greenland itself could become much smaller duri...