读“我国土地利用类型的构成”图，回答下列各题
He had hoped to have an opportunity to travel abroad for long. But it was a(n) ______ that he missed it when it came last month.
我国冬季一月平均气温0℃经过（ ）
如图电路中，电源E的电动势为3.2V，电阻R的阻值为30Ω，小灯泡L的额定电压为3V，额定功率为4.5W．当电键S接位置1时，电压表的读数为3V，那么当电键S接到位置2时，小灯泡L的发光情况是:
