It is a good idea to  1 a small present when you go to a  2 party in England or the USA. Flowers are always nice or you may bring a bottle of wine  3 you know what the family  4  . You should arrive on time or  5 minutes late. Don't get there early. If you are going to be there  6 fifteen minutes late, you should call and tell the host and hostess. Try to relax at the dinner table. If you don't know  7 to use the fork(叉子), the knife, or the spoon, just watch  8 and follow them. You can also ask someone next to you. If you like the food, say so. Of course, you will thank the host and the hostess  9 the meal and for their kindness. It's good to send a card or a “thank you” note the   10 day.

小题1:A. bring               B. take                 C. carry

小题2:A. breakfast           B. lunch                C. birthday

小题3:A. when                B. if                   C. so

小题4:A. eat                 B. drinks               C. drink

小题5:A. five                B. ten                  C. five to ten

小题6:A. less than           B. more than            C. about

小题7:A. why                 B. how                  C. what

小题8:A. other               B. the others           C. others

小题9:A. for                 B. of                   C. at

小题10:A. later              B. tomorrow             C. next

关于原子核的衰变、聚变和裂变，下列表述正确的是

A．半衰期越短，衰变越慢

B．核反应堆中插入镉棒为了增大核裂变的反应速度

C．γ射线穿透能力最强，α射线电离能力最强

D．核聚变和核裂变过程都有质量亏损