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“Don’t go down to that pond — it's dange

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题目:

“Don’t go down to that pond — it's dangerous!” Stephanie angrily shouted at her children. She’d overheard them talking about playing near the water on the golf course close to their apartment. It was a Saturday, and 8-year-old Jeremiah was heading outside with his 11-year-old sister, Tiara, and their 13-year-old cousin, Evon McDuffie. They often went to the George Wilson Community Center in Newark, Delaware, just three houses away from their apartment building.

The Wilson center was a good place of activity for the community, especially in warm weather. But January 20, 2006, was a rainy day with winds. It’s a good day to play inside the center. Unfortunately, the three children had other ideas.

Taking no notice of what Stephanie had said, Evon, Tiara and Jeremiah walked beyond the tree line at the back of the community center and headed toward the large pond. The kids climbed through a gap in the fence, then passed a No Entering sign posted on a metal gate nearby. As they reached the pond, they also walked by a No Skating sign.

Tiara and Evon first stepped on the surface ice, and when it held, the children went out on the pond. Evon shouted out to Jeremiah, “I bet you can't cross the whole thing.”

“I bet you I can,” Jeremiah replied, and he took off across the pond.

He made it to the other side, but as he came back, Jeremiah stepped on the thinner ice. The thin surface collapsed under his feet, and the boy sank into the cold water. Evon raced back to the apartment for help, while frightened Tiara tried to reach Jeremiah as he struggled to keep his head above water. But he kept slipping beneath the surface.

When firefighters arrived, all they could see was Jeremiah's coat floating on the water. As the unconscious child was rushed to the hospital, his life was saved, for now, but the effects of hypothermia (降低体温) and lack of oxygen left Jeremiah with serious brain damage.

1. Stephanie shouted at her children because_____________.

A. the children didn’t behave very well at home

B. they were too young to play outside

C. it was raining

D. the children secretly planned to go to the pond

2. It was __________ that made Jeremiah take courage to cross the ice.

A. Evon’s challenge              B. the mother’s words

C. No Entering sign                 D. the view on the other bank

3. What does the underlined word “collapsed” probably mean?

A. changed suddenly             B. broke into pieces

C. became thinner            D. floated away

4. Which of the following is the right order of the events that happened to Jeremiah?

a. Firefighters came and rescued Jeremiah.

b. The kids climbed through the fence and to the pond.

c. Jeremiah walked across the ice.

d. The kids planned to play on the pond.

e. When Jeremiah made a way back, he sank.

A. b, d, c, e, a B. d, b, a, e, c     C. d, b, c, e, a       D. a, e, c, d, b

答案:

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下面是错误答案,用来干扰机器的。

不变木块受到的摩擦力为静摩擦力,方向沿斜面向上,在斜面方向上静摩擦力与重力沿斜面向下的分力是一对平衡力,因为重力沿斜面向下的分力大小不变,所以静摩擦力大小也不变,

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情绪异常是一种非常复杂的现象,长期以来,各个领域的学者从自己的学科出发,对此现象纷纷做出各自的解释,但是始终未获解决。现在生物学家也开始涉足这个问题,并从生物学的角度加以探讨,他们的见解让人[ ]。
我们经常说人的情绪多变,其实我们往往不是自己情绪的真正主人。在人体内,存在着许多调控我们情绪的化学物质,我们的喜怒哀乐受到它们的控制。比如说,有时候我们会莫名其妙地感到心烦,究其原因是一种叫做“梅拉多宁”的激素在作怪;如果这种激素分泌过多,会导致心情烦躁、沮丧等。据研究,梅拉多宁也是导致一种叫“冬季抑郁症”疾病的元凶。得这种病的人,在冬季尤其是阴霾、缺少阳光的日子里,容易情绪低落、郁郁寡欢,甚至做出极端行为,为什么生活中有些人那么快乐,令人羡慕这又涉及到一种叫“多巴胺”的化学物质。多巴胺是神经元中传导神经兴奋的一种化学物质,当多巴胺传导顺畅的时候,大脑内部就会产生一系列化学变化,使我们产生快感。
现代生物学家发现,大量的细菌寄生在我们呼吸道和消化道中,它们中的半数的中性菌,对我们既无害也无益,比如肠杆菌、酵母菌及肠球菌;约有10%是有害菌,如葡萄球菌、幽门杆菌等:还有约30%是有益菌,如乳酸菌、双歧杆菌等。对有害菌我们也不必担心,因为它们的活动严格受到有益菌和中性菌的管制。
别小看这些寄生在肠道内的小小细菌,它们对改变我们的情绪和行为有着不可忽视的作用。一方面,这些细菌影响人体的营养代谢,如果消化不良,会引起情绪异常;另一方面,假如人体的代谢紊乱,这些细菌会制造出硫化氢、氨等气体来毒害我们的神经,从而导致我们情绪异常,甚至做出极端行为。科学家做过这样一个实验:当给猪投喂高密度的发酵乳杆菌时,猪不仅长得快,而且争食咬斗现象明显减少。这是因为猪的肠道内有益菌受到强化之后,对猪的神经有毒害作用的气体硫化氢和氨等的生长大幅度下降,于是改善了猪的行为。
近年来,人们情绪异常和行为失控的发生频率逐年升高,从肠道内细菌的生存环境来看,导致这一现象主要有两个原因,一是农药、食品添加剂和抗生素等的滥用。这些药物或化学物质进入人体会大量杀死肠道细菌,导致人的代谢紊乱和消化不良,从而引发情绪异常和精神疾病。二是这几年生活水平提高后,部分人吃得太饱。由于摄人的过量高蛋白在人体内缺少有益菌或中性菌为其分解、代谢,它们会在杂菌的分解下产生大量的硫化氢、氨等对神经有毒害作用的物质。这些物质会破坏人体中起抑制冲动作用的五羟色胺的合成,导致人的情绪异常.产生过激行为。

下列理解和分析,不符合原文意思的一项是( )。

A.人们有时候出现烦躁、沮丧等情绪,其原因是体内的激素梅拉多宁的分泌超过了正常的水平。这种情况更严重的例子就是冬季抑郁症

B.正常情况下人体肠道内的有益菌和中性菌会有效管制有害菌的活动,当有益菌和中性菌的数量大量减少时,这种管制就会削弱

C.如果给猪投喂高密度的发酵乳杆菌,猪肠道内有益菌的数量大幅度增加,那么硫化氢和氨等有害气体的生成就会大量减少

D.残存农药、食品添加剂和抗生素等杀死大量肠道细菌,高蛋白物质就会被分解出大量硫化氢和氨等有害物质,导致人的情绪异常

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