题目

下列说法正确的是（ ） A．房屋着火，可以用水灭火，是因为降低了可燃物的着火点 B．天然气泄漏，迅速关闭阀门并开窗通风 C．家用电器着火立即用水浇灭 D．室内起火，迅速打开所有门窗通风 答案：B根据上下文和提示完成句子。1. What are you doing for vacation??    _______________________________________ (sightsee).? 2. What are the twins doing for vacation??     ______________________________________ (go hiking in the mountain).? 3. ______________________________________?     He's fishing.? 4. ______________________________________?     She's bike riding.? 5.What are you and your family doing on Sunday??     _____________________________________  (have a picnic in the park).?