下列哪项是1980年《联合国国际货物销售合同公约》在规定承诺生效时间上采用的原则( )。
A．投邮生效主义
B．到达生效主义
C．了解生效主义
D．有限制的到达生效主义，即在以函件、电报、电传达成协议的情况下，以作出书面确认书的时间为合同成立的时间
参考答案：B
解析：本题考《联合国国际货物销售合同合约》中承诺生效时间采用的原则。对于承诺生效的时间，英美法系国家和大陆法系国家分别采用的是投邮生效主义和到达生效主义，1980年公约采纳了到达生效主义。因此，本题的正确答案是B。
| 完型填空 | |||
| Food is very important. Everyone needs to (1)_____ well if he or she wants to have a strong body. Our minds also needs a kind of food. This kind of food is (2)_____. We begin to get knowledge even when we are very young. Small children are (3)_____ in everything around them. They learn (4)_____ while they are watching and listening. When they are getting older, they begin to (5)_____ story books, science book and so on. When they find something new, they love to ask questions and (6)_____ to find out the answers. What is the best (7)_____ to get knowledge? If we learn (8)_____ ourselves, we will get the most knowledge. If we are (9)_____ getting answers from others and do not ask why, we will never learn well. When we study  in the right way,we will learn more and understand (10)_____. | |||
| ( )1. A. sleep ( )2. A. sport ( )3. A. interested ( )4. A. everything ( )5. A. lend ( )6. A. try ( )7. A. place ( )8. A. on ( )9. A. often ( )10.A. harder | B. read B. exercise B. interesting B. something B. read B. have B. school B. with B. always B. much | C. drink C. knowledge C. weak C. nothing C. learn C. think C. way C. to C. usually C. better | D. eat D. meat D. better D. anything D. write D. wait D. road D. by D. sometimes D. well |