问题 实验题

读图,回答问题:

1.人体最大的消化腺是[   ]__________它能分泌_________促进脂肪的消化.

2.人体最重要的消化腺是[   ] ______________,它能分泌消化淀粉、蛋白质和脂肪的消化酶。

3.某人患急性阑尾炎,需要开刀的结构是[14]__________。

4.在消化系统中,[  ]__________是食物消化的第一站,在这里可以把一部分淀粉分解为麦芽糖。蛋白质开始消化的部位是[   ]______ ____,脂肪消化的初始部位和最终场所是[   ]___________。

答案

1.10;肝脏;胆汁2.4;胰腺3.阑尾4.1口腔;3胃;6;小肠

题目分析:1.人体内的消化腺包括大消化腺和小腺体.大消化腺有唾液腺、肝脏、胰腺.肝脏是人体最大的消化腺,成人的肝重约1.5kg,位于腹腔的右上部,肝脏能够分泌胆汁,首先将胆汁储存在胆囊内,然后胆汁从胆管进入小肠,胆汁中不含消化酶,但它对脂肪有乳化作用,将大的脂肪颗粒乳化为小的脂肪微粒,对脂肪进行物理性消化.从而促进脂肪的消化.

2.人体最重要的消化腺是胰腺,它能分泌消化淀粉、蛋白质和脂肪的消化酶.

3.大肠的起始部位叫做盲肠,盲肠上连着一条细小的盲管叫做阑尾,患急性阑尾炎时需切除阑尾.

4.口腔中含有唾液,唾液中有唾液淀粉酶,只能消化淀粉,故淀粉消化的开始部位是口腔,最终被分解为葡萄糖;

胃中有胃液,胃液中含有胃蛋白酶,只能够消化蛋白质,故蛋白质的消化开始部位是胃,最终被分解为氨基酸;

小肠是消化和吸收的主要场所,含有多种消化酶,脂肪在小肠中才开始得到消化,最终被分解为甘油和脂肪酸.

单项选择题

(一)

On May 29, 1973, Thomas Bradley, a black man, was elected mayor of Los Angeles. Los Angeles is the third largest city in the United States, with a population of three million. About sixteen percent of the city’s population are black.

News of this election appeared on the front pages of newspapers everywhere in the United States. Here is how one major newspaper reported the event.

LOS ANGELES ELECTS BRADLEY MAYOR UNSEATING YORTYBLACK WINS 56 OF VOTES

Bradley called his victory over Yorty "the fulfillment of a dream". During his childhood and youth, people had kept telling him, "You can’t do this, you can’t go there, because you are a Negro. " Nevertheless he had won a decisive victory over a man who had been won 43.7 percent.

Los Angeles voters have had many opportunities to judge. Thomas Bradley had to form an opinion of him. The son of a poor farmer Texas, he joined the Los Angeles police force in 1940. During his twenty-one years on the police force he earned a law degree by attending school at night. He was elected to the city council ten years ago.

At the time of the Los Angeles election, three other American cities already had black mayors, but none of those cities had as large a population as Los Angeles. Besides, the percentage of blacks in those other cities was much larger. Cleveland, Ohio, had thirty-six percent black when Carl Stokes was elected mayor of Cleveland in 1967. In the same year Richard Hatcher was elected mayor of Cary. In Newark, New Jersey, sixty percent of the population were black when Kenneth Gibson was elected in 1970. Thus election of a black mayor in those cities was not very surprising.

In Los Angeles thousands of white citizens voted for Thomas Bradley because they believed he would be a better mayor than the white candidate. Bradley had spent forty-eight of his fifty- five years in Los Angeles. Four years ago Bradley lost mayoral election to Yorty. This time Bradley won.

Bradley hit the front page headline for().

A.he was the first black mayor in history

B.he was the first black mayor in the south of the USA

C.he was the first black mayor of one of the largest cities in the USA

D.a poor farmer’s son could also win an important election

单项选择题 A1型题