世界上最大的热带雨林区是
A.刚果河流域
B.亚马孙河流域
C.东南亚的马来群岛
D.澳大利亚东侧
答案:B
题目分析:亚马孙雨林面积最大,所以亚马孙河流域分布的热带雨林世界最大。
如图所示,电源电压保持不变.闭合开关,当滑动变阻器的滑片P从a向b滑动的过程中,设灯泡工作时的电阻不变.下列说法正确的是
A.L1灯逐渐变亮
B.L2灯逐渐变亮
C.电流表的示数变小
D.滑动变阻器两端的电压逐渐变大
根据句意及首字母提示完成单词。
1. I thought hard and tried to get out of the e_____situation.
2. She didn't r_____her mistake until we told her.
3. If the bell r_____, we'll have to leave at once.
4. E_____is here, then let's start playing.
5. I've n_____been to the USA before.