An order has come from Berlin that no language but German may be taught in the schools of Alsace and Lorraine.
此句中的that从句引出同位语从句，也就是说它补充说明前面order的内容，类似的句子有：
I had the impression that he would become an entrepreneur. 我过去有过印象，他将会成为一名企业家。（此句中连词that引出同位语从句说明impression的内容。）
I have a feeling he may get divorced. 我有一种他会离婚的感觉。（feeling后面省略了that。）
His prediction that there would be an earthquake frightened us all. 他预言会发生地震，把我们都吓坏了。（这里的that从句说明prediction的内容。）
I have no idea what you mean. 我不知道你什么意思。（疑问词引导一个从句，不再用连词that。）
News came from the front that our Red Army had defeated the enemy. 从前线传来消息，我们的红军打败了敌人。（此句中that clause说明news 的内容。）

NOTES TO THE DIALOGUE

You remember how to get to our school, don't you?
I take the No. 7 bus and get off at Headingley. Then I cross the road and turn right. Isn't that right?
这两句话都是反意问句，其特点是：如果前面部分是肯定陈述句，后面部分就要用否定式；如果前面部分是否定疑问式，后面就要用肯定式。在主从句当中多以主句为基准，也有少数以从句为基准，这要看提问的人是对什么发出提问了。例如：
I am late, aren't I? 我迟到了，不是吗？（这里不能用ain't I也不能用am I not）
You hardly know her, do you? 你几乎不认识她，对吗？（hardly是否定词，其他如seldom，few，little等，都算否定词。）
No doubt you'd rather he stay in America now, wouldn't you? 毫无疑问，你宁愿让他现在呆在美国。（以前面的主句为基准）
I suppose you're not serious, are you? 我想你不是当真的吧，是吗？（以后面的从句为基准）
反意疑问句念的时候一般用升调，但如果用反意疑问句只是为了加强陈述句的语气而不需要对方回答的话，念的时候就要用降调。比如：
It's a lovely day, isn't it? 今天天气很好，不是吗？