下列图形中，不是轴对称图形的是（      ）

关于东南亚的叙述，正确的是（   ）

I w____ to Qingdao with my parents last summer holiday. We t____a plane there. We went to the beach. It was very b ____. I like swimming very much. I s____in the sea. My mum took many p____ there. We had a good time.

同一艘船从河里驶向海里时，下列说法中正确的是（   ）

加在某导体两端的电压为6伏时，通过导体的电流为0．5安，则该导体的电阻为____ 欧；若加在导体两端的电压变为12伏时，导体中的电流为____ 安，导体的电阻为 ____欧。