下列地理现象能说明地球自转的是（　　）

①Is the picture on the table? ____           A. Nice to meet you, too!

②Thank you! ____                   B. It's a watch.

③Where are the computers? ____         C. You're welcome.

④Is Sally your sister? ____                 D. It's Smith

⑤What's this in English? ____             E. No, it isn't.

⑥Can you spell it, please? ____           F. Yes, A-N-N, Ann.

⑦Is his pen brown? ____                G. No, it's on the wall.

⑧Nice to meet you! ____              H. They're on the desk.

⑨What's his last name? ____             I. Thank you!

⑩Your jacket is very nice. ____              J. Yes, she is.

①将花蕾在酒精中浸泡约30s

②放入氯化汞液中2～4 min

③无菌水清洗，然后用吸水纸吸干花蕾表面的水分

④用无菌水冲洗3～5次