在CIF条款下，（）负责租船订舱与投保，运费支付方式是（）。
A.买方到付运费
B.卖方预付运费
C.收货人到付运费
D.卖方第三地支付
参考答案：B
断裂基因(split gene)
In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. There are two types of key technology: private key and public key. Private-key encryption methods are called (71) ciphers, information is encrypted with (72) both the sender and receiver hold privately. Public-key encryption methods are called (73) ciphers, (74) created for each user, encryption key and decryption key are (75)
A．two related keys are
B．a key is
C．two unrelated keys are
D．three keys are
