第21题: [单项选择]Small children can not ______ the difference between right and wrong. It is our duty to teach them. A. appreciate B. enjoy C. acknowledge D. confess 参考答案:A 答案解析:[解析] A项“appreciate鉴别,正确评价”符合题意,如:A musician can appreciate small differences in sounds. (音乐家能辨别声音中极细
第27题: [单项选择]TD-LTE的关键技术最全面的一项是() A. TD双工技术、OFDM多址接入技术、扁平化 B. TD双工技术、OFDM多址接入技术、MIMO多天线技术 C. TD双工技术、OFDM多址接入技术、MIMO多天线技术、扁平化 D. OFDM多址接入技术、MIMO多天线技术、扁平化、高速率 参考答案:C