在10个小麦种子袋中选出300粒种子测定发芽率，有270粒种子在一定时间内发了芽，那么，这10袋种子的发芽率是（ ）
A：10%
B：20%
C：80%
D：90%
下列实验现象描述错误的是（ ）
①2FeCl3+2KI=2FeCl2+2KCl+I2
②2FeCl2+Cl2=2FeCl3
③2KMnO4+16HCl=2KCl+2MnCl2+5Cl2↑+8H2O
若某溶液中有Fe2+和Cl﹣、I﹣共存，要氧化除去I﹣而又不影响Fe2+和Cl﹣．可加入的试剂是（ ）
1. Please clean up before leaving.2. Showers(淋浴)to be taken before 11 p.m..3. No staying out after 10 p.m. unless allowed by me.4. You may have incoming calls on my phone but no outgoing calls.5. Bed time is 11 p.m.6. Dinner is at 7 p.m. unless notified(通知). (If you don’t have dinner, you must let us know before 6 p.m.)7. Keep noise to the least.8. No smoking in the bedroom. The Address you are staying at is: 112 Kendal Way Cambridge My contact number: 07870 347980
