在所有条件都具备的前提下，加热炉点不着火的主要原因是负压过大造成的。（）
参考答案：对
一块长方形菜地，长14米，宽11米．
（1）四周围上竹篱笆，篱笆长多少米？
（2）如果一面靠墙，竹篱笆至少要多少米？
—Did your uncle tell you ________?
—Yes, he said he went there in 2008. [ ]
A. how he goes to Wuhan
B. why did he visit Kunming
C. when he traveled to Hong Kong
D. where did he spend his vacation
