下列叙述中正确的是（ ）
A．标准状况下，22.4 LCO2和O2混合气体中含有6.02×1023个氧原子
B．常温常压下，0.1 mol铁在0.1 mol Cl2中充分燃烧，有1.806×1023个电子转移
C．一定条件下，2molSO2和1molO2反应达平衡后，密闭容器内分子总数大于1.204×1024
D．1 L 1 mol/L的K2CO3溶液中含有1.806×1024个离子
C
A项，混合气体含氧原子为2mol,A错；B项，氯气完全反应，而铁没有完全反应，转移电子数为0.2mol,B错；假设完全反应生成2molSO2,可逆反应不可能完全反应，平衡体系中，气体物质的量在2mol～3mol之间，C正确；D项，CO32-+H2O
HCO3-+OH-，离子数增多，所以，1molK2CO3所含离子大于3mol，D错。
| Phyllis Wheatley is regarded as America’s first black poet. She was born in Senegal, Africa, about 1753 and brought to America aboard a slave ship at about the age of seven. John and Susannah Wheatley bought her for three pounds at a slave auction in Boston in 1761 to be a personal servant of Mrs. Wheatley. The family had three other slaves, and all were treated with respect. Phyllis was soon accepted as one of the family, which included being raised and educated with the Wheatley’s twin 15-year-old children, Mary and Nathaniel. At that time, most females, even from better families, could not read and write, but Mary was probably one of the best educated young women in Boston. Mary wanted to become a teacher, and in fact, it was Mary who decided to take charge of Phyllis’s education. Phyllis soon displayed her remarkable talents. At the age of twelve she was reading the Greek and Latin classics and passages from the Bible. And eventually, Mrs. Wheatley decided Phyllis should become a Christian. At the age of thirteen Phyllis wrote her first poem. She became a Boston sensation after she wrote a poem on the death of the evangelical preacher George Whitfield in 1770. It became common practice in Boston to have "Mrs. Wheatley’s Phyllis" read poetry in polite society. Mary married in 1771, and Phyllis later moved to the country because of poor health, as a teacher and caretaker to a farmer’s three children. Mary had tried to interest publishers in Phyllis’s poems but once they heard she was a Negro they weren’t interested. Then in 1773 Phyllis went with Nathaniel, who was now a businessman, to London. It was thought that a sea voyage might improve her health. Thirty-nine of her poems were published in London as Poems on Various Subjects, Religious and Moral. It was the first book published by a black American. In 1775 Phyllis wrote a poem extolling the accomplishments of George Washington and sent it to him. He responded by praising her talents and inviting her to visit his headquarters. After both of her benefactors died in 1777, and Mary died in 1778, Phyllis was freed as a slave. She married in 1778, moved away from Boston, and had three children. But after the unhappy marriage, she moved back to Boston, and died in poverty at the age of thirty. |
What does the passage mainly discuss
A．Slavery and the treatment of the black people in America.
B．The Wheatley family, including their slaves.
C．The life of America’s first black poet.
D．The achievements of Phyllis Wheatley.