A：父亲老实厚道低眉顺眼累了一辈子。（形容驯服、顺从的样子）
B：虽然这些都很微不足道，但他做得很认真。（非常渺小，不值得一说）
C：农村里有这么个风俗，大庭广众之下，夫妇俩从不合坐一条板凳。（非常大的庭院内有很多人）
D：偶尔出去一趟，回来时，一副若有所失的模样。（好像失掉了什么似的。形容心神不定）
阅读短文，完成下列任务。
Both the British and Americans speak English. However, there are several differences between American English and British English. For example, the words they use in daily life are not the same. The British call the first floor of a building the ground floor. The floor above the ground floor is the first floor, which Americans call the second floor. Once you go to Britain and America, you may notice other differences. The British usually hide their feelings. They don't often start a talk with strangers. On the train the British often spend their time reading newspapers or books. But Americans are more active and easier to talk with.
马克思主义诞生的标志是
