【简答题】B Visiting Canada This Summer? A visit to Canada begins with a stop at customs. This can be done quickly if visitors keep in mind the following general tips: * Most American visitors are allowed i...
【简答题】What fears people most? [A] Poultry will infect many people. [B] The disease can spread quickly among people. [C] There will be human-to-human transmission. [D] A new disease combining bird and a huma...