小明在纸叠的小船中加入适量的水,用酒精灯直接加热,纸船安然无恙。纸船没有燃烧,原因是
A:纸船不是可燃物
B:纸船没有与氧气接触.
C:温度没有达到纸船的着火点
D:水能灭火
在美国弗罗里达州曾出现大规模的赤潮,引起这种现象的原因是( )
参考词汇:Saturday, Sunday, morning, afternoon, evening…
do homework, watch TV, go hiking, play sports, go camping, ride a bike, take pictures, clean the room, wash the clothes …
Monday, June 6th
I was busy last weekend. On Saturday, I
下列不属于调查的是( )