问题 选择题

当人体免疫功能过高时,会发生的疾病是

A.艾滋病

B.过敏反应

C.肺结核

D.肝癌

答案

答案:B

题目分析:免疫的功能包括自身稳定(清除体内衰老的、死亡的或损伤的细胞)、防御感染(抵抗抗原的侵入、防止疾病发生、维护人体健康)、免疫监视(识别和清除体内产生的异常细胞如肿瘤细胞),当免疫功能异常时人体会发生疾病;例如防御感染的功能过强时,对进入人体内的某些药物和食物会发生过敏反应,当自身稳定的功能异常时人体会发生自身免疫性疾病,当免疫监视功能异常时人体可能会发生肿瘤.选项中艾滋病和肺结核是由病原体引起的传染病,肝癌的致病因素复杂,可能与人体的免疫监视功能过低有关。故选:B

填空题
单项选择题

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.

It can be inferred that Phyllis’s trip to England with Nathaniel in 1773________.

A.did not improve her health

B.was for business reasons

C.led to books of her poems being available in America

D.led to the publication of her poems because the English were more interested in religious and moral subjects