并联电容器组交接试验验收中，电容器组桥臂、单相及整组电容值测量总容量3Mvar以上电

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.

According to the passage, an unusual feature of Mary was that she ______.

A．was not much older than Phyllis

B．wanted to become a teacher

C．was comparatively well educated

D．decided to take charge of Phyllis’s education

【地理—旅游地理】 阅读材料，回答问题。 自然保护区按功能划分为核心区，缓冲区和实验区，核心区是区内保存完好的天然状态的生态系统及珍稀、濒危动植物的集中分布在；缓冲区只准从事科研活动；实验区可开展旅游活动。 崇明岛位于长江入海口，是我国第三大岛，为亚太候鸟南北迁徙通道上的重要驿站，也是我国东中沿海的重要水禽越冬地，已成为周边地区生态旅游目的地。图9为崇明岛生态旅游资源分布示意图。

指出在鸟类自然保护区发展生态旅游时就注意的事项。

钢筋冷拉夜间作业的照明设施，应装设在张拉危险区（）。

A.外

B.内

C.上方

D.后方

男性，29岁。高处坠落2小时后送至医院。主诉胸背部疼痛，双下肢不能活动。

首先考虑下列哪种情况可能性大（）

A.单纯脊髓或马尾神经损伤

B.脊柱损伤合并脊髓或马尾神经损伤

C.双下肢骨折

D.骨盆骨折

E.胸部损伤

以下是科学家采用不同方法培育良种牛的过程，a－h为操作过程，请据图回答有关问题：

图中用到的激素是（），其目的是获得更多的卵母细胞，经受精后可得到早期胚胎。