3) Most British families still keep the habit of sitting down together for breakfast.
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4) Before the early nineteenth century, traffic drove on the left in most European countries.
A. 对
B. 错
5) The summer season in Britain is not as pleasant as it used to be in the past.
A. 对
B. 错
计算机网络的硬件基础不包括（ ）
A. 协议
B. 交换机
C. 路由器
D. 光纤
协议规定了通信实体之间所交换的消息的（ ）
A. 格式
B. 意义
C. 顺序
D. 以上全是
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