题目
Questions 6 to 10 are based on the following passage:
Half of the world&39;s coral reefs (珊瑚礁)have died in the last 30 years. Now scientists are racing to ensure that the rest survive. Even if global warning were to right now, scientists predict that more than 90% of corals will die by If no major steps are taken to address the problem, the reefs may be headed for total extinction (灭绝).
(78) The planet ’s health depends on the survival of coral reefs. They described as “the rainforests of the sea", because they provide shelter for a wide variety of sea life. In addition, the reefs serve as barriers that protect coastlines from the full force of powerful storms. Coral are used in medical research for cures to diseases. They are key to local economies as well, since the reefs attract tourists, the fishing industry, and other businesses, bringing in billions of dolllars.
(79)Corals are particular sensitive to changes in temperature. A rise of just 1 to 2 degrees can force the corals to drive out the algae (水藻). Then the corals turn white in a process called “bleaching”. Corals can recover from short-term bleaching, but long-term bleaching can cause permanent damage. In 1998, when sea surface temperatures were the highest in recorded history, coral reefs around the world suffered the most severe bleaching. It is estimated that even under the best of conditions, many of these coral reefs will need decades to recover.
Although reefs face other threats from pollution, industrial activities, and overfishing, it is global climate change that most concerns scientists. Scientists remain hopeful that it’s not too late to save the reefs, and some are moving ahead on experiments to accomplish that goal.
6. Which of the following is the best title for the passage?
A.Rising Global Temperatures
B.Rainforests Are in Danger
C.Coral Reefs Face Extinction
D.Global Climate Change
The word address in Paragraph 1 is closest in meaning to _____.A.break down
B.stick to
C.go over
D.deal with
Why are coral reefs called "the rainforests of the sea"?A.Because they are home to a wide variety of sea life.
B.Because they can protect our coasts from storms.
C.Because they might supply natural medicines.
D.Because they look like rainforests.
According to the passage, _____ is the biggest threat to coral reefs.A.pollution
B.overfishing
C.industrial activity
D.dimate change
The corals turn _____ in the process of “bleaching”.A.red
B.black
C.green
D.white
请帮忙给出每个问题的正确答案和分析,谢谢!
第1题
A.1/150
B.90
C.0.5
D.0.1
第2题
A.1/150
B.90
C.0.5
D.0.1
第4题
A.按照 保里不相容原理 ,每个电子层的电子容量为 2n 2 个
B.当轨道处于完全充满时,电子较稳定,故 35 Br 的电子排布为 [Ar]3d 10 4s 1 4p 6
C.原子中核外电子的 排 布是根据三规则、一特例得出的
D.能量最低原理解决了电子在不同亚层中的排布顺序问题,而洪特规则解决了电子在简并轨道中的排布问题
第6题
Passage 2 Questions 6 to 10 are based on the following passage:
How men first learned to invent words is unknown; in other words, the origin of language is a mystery. All we really know is that men, unlike animals, somehow invented certain sounds to express thoughts and feelings, actions and things, so that they could communicate with each other; and that later they agreed upon certain signs, called letters, which could be combined to represent those sounds, and which could be written down. Those sounds, whether spoken, or written in letters we call words.
The power of words, then, lies in their combinations — the things they bring up before our minds. Words become filled with meaning for us by experience; and the longer we live, the more certain words recall to us the glad and sad events of our past; and the more we read and learn, the more the number of words that mean something to us increases.
Great writers are those who not only have great thoughts but also express these thoughts in words which appeal powerfully to our minds and feelings. This charming and telling use of words is what we call literary (文字的) style. Above all, the real poet is a master of words. He can convey his meaning in words which sing like music, and which by their position and association can move men to tears. We should therefore learn to choose our words carefully and use them accurately, or they will make our speech silly and rude.
第6题:The origin of language ________.
A. is reflected in sounds and letters B. is handed down from generation to generation C. dates back to the prehistoric period D. is a problem not yet solved
第9题
A.Mg > S > Si > Ar
B.Ar > Mg > Si > S
C.Si > Mg > S > Ar
D.S > Mg > Ar > Si
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