A：氢氧化钠的醇溶液，加热
B：氢氧化钠的水溶液，加热
C：稀硫酸，加热
D：银氨溶液
____ ____ is on the second of October.
⑴I'm hungry.____ A. She's running.
⑵What are you doing?____ B. He's making noodles.
⑶What are they doing?____ C. I'm hungry, too.
⑷What is she doing?____ D. They are rowing a boat.
⑸What is Sam doing?____ E. I'm reading a book.
公元前510年，罗马共和国在意大利半岛崛起，其最重要的国家机构是（ ）
