单项选择题A．To help identify where infectious diseases are developing.B．To help small and medium size businesses grow.C．To help improve public services.D．To help two climate change programs.

单项选择题A．Top industrial countries met in the US for world finance.B．Developing economies met in the US for a summit on finance.C．G20 leaders met in the US for a summit on future world culture.D．Developing and top industrial economies met in the US for a summit on finance.