根据我国食物与营养发展的指导思想，食物与营养发展的重点领域不能放在（）。
A.大豆产业
B.奶类产业
C.酒类产业
D.食品加工业
参考答案：C
主要用于控制疟疾复发和传播的药物是
A．氯喹B．哌嗪C．乙胺嘧啶D．伯氨喹E．青蒿素
In a public-key cryptosystem, (71) encrypted with the public key can only be deciphered with the private key from the same (72) . Conversely, (71) encrypted with the private key can be decrypted only with the public key. Users can make their public keys (73) available or place them at a key distribution center or others to access. However, the private key must be (74) safe. In public-key systems there’s no (75) to find a safe channel for communicating a shared secret key.
A．free
B．freely
C．locally
D．partly
