A beautiful autumn day like this ________for the wet summer we have had.

单项选择题He has done stupid things before, but to look for the escaping gas with a match really was the ________silliness.

单项选择题The past decade has been the warmest for 1,000 years, according to a(n) ________of ice cores drilled from a glacier(冰川) in the Himalayas.