路由器可在( )实现网络互联。
A．数据链路层
B．传输层或传输层以上
C．网络层
D．数据链路层或网络层
参考答案：C
The young couple wrote to Mr Grand to ________ his warm reception during their visit to his farm. [ ]
A. acknowledge
B. update
C. consult
D. acquire
预防接种口蹄疫疫苗最好安排在什么季节？
