商业银行发行次级债券应聘请证券信用评级机构进行信用评级。其发行可采取一次足额发行或限额内分期发行的方式。( )
参考答案：对
把下列句子改为含有定语从句的主从复合句。
1. I know the boy. He can speak English well.
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2. The season is summer. It comes after spring.
3. The building is my uncle's house. Its wall is white.
4. Will you please lend me the very book? You bought a book last Sunday.
5. The student is our monitor. Our headmaster praised him at the school meeting.
活性宫内节育器是指（）IUD和（）IUD，与惰性IUD比较，它的优点是（）。
