单项选择题

三只小猪的故事中，老大是用哪种材料盖的房子？

A.稻草
B.木头

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单项选择题

放大电路交流通路的画法是。
A、理想直流电源开路，大容量电容开路
B、理想直流电源开路，大容量电容短路
C、理想直流电源短路，大容量电容开路
D、理想直流电源短路，大容量电容短路

Jane said, "What did he hear about a week ago?”Jane asked about _.
A、that he heard … a week ago
B、what he had heard … the week before
C、what he had herd … a week ago
D、if he heard … the week ago

答案： what he had heard…the week before