围绕本课标题 The Channel Tunnel 海峡隧道（英法海峡隧道）主题，AI 老师会出 若干个简单问题，
每个问题听完后，用 完整句子口头作答。
⚠️ 尽量说完整句子，不要只说一个词；优先用本课句型与词语：arrived in England with a plan for a twenty-one-mile tunnel / under the English Channel / serve as a port and a railway station / well-ventilated if tall chimneys were built / above sea level / a better plan was put forward / He suggested that a double railway-tunnel should be built / solve the problem of ventilation / draw in fresh air behind it / a tunnel was actually begun / If the British had not feared invasion / it would have been completed / wait almost another 100 years / it was officially opened / connecting Britain to the European continent