[单项选择]At some time around 2300BC, give or take a century or two, a large number of the major civilizations of the world collapsed, in Mesopotamia, Egypt, Israel, Anatolia, and Greece, as well as in Afghanistan and China. All of them the first urban civilizations fell into rain at more or less the same time. A thousand years later, around 1200BC, many of the civilizations of the same regions again collapsed at about the same time.
The reasons for these widespread and apparently simultaneous disasters which coincided with changes to cultures and societies elsewhere, such as in Britain, have long been a fascinating mystery. Traditional explanations included warfare, famine, and more recently systems collapse, but the apparent absence of direct archaeological or written evidence for causes, as opposed to effects, has led many archaeologists and historians into a resigned assumption that no definite explanation can be found.
Over the past 15 years, however, a new type of ’natural disast
A. Clube and Napier.
B. Luis Alvarez.
C. Claude Schaeffer.
D. Baillie and Macki

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[单项选择]At some time around 2300BC, give or take a century or two, a large number of the major civilizations of the world collapsed, in Mesopotamia, Egypt, Israel, Anatolia, and Greece, as well as in Afghanistan and China. All of them the first urban civilizations fell into rain at more or less the same time. A thousand years later, around 1200BC, many of the civilizations of the same regions again collapsed at about the same time.
The reasons for these widespread and apparently simultaneous disasters which coincided with changes to cultures and societies elsewhere, such as in Britain, have long been a fascinating mystery. Traditional explanations included warfare, famine, and more recently systems collapse, but the apparent absence of direct archaeological or written evidence for causes, as opposed to effects, has led many archaeologists and historians into a resigned assumption that no definite explanation can be found.
Over the past 15 years, however, a new type of ’natural disast
A. matching climate change data to dates of apparent historical catastrophes.
B. looking at evidence found in the layers of the earth.
C. analyzing tree rings.
D. analyzing seismic activity in history.

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[单项选择]Passage Five

At some time around 2300BC, give or take a century or two, a large number of the major civilizations of the world collapsed, in Mesopotamia, Egypt, Israel, Anatolia, and Greece, as well as in Afghanistan and China. All of them the first urban civilizations fell into rain at more or less the same time. A thousand years later, around 1200BC, many of the civilizations of the same regions again collapsed at about the same time.
The reasons for these widespread and apparently simultaneous disasters which coincided with changes to cultures and societies elsewhere, such as in Britain, have long been a fascinating mystery. Traditional explanations included warfare, famine, and more recently systems collapse, but the apparent absence of direct archaeological or written evidence for causes, as opposed to effects, has led many archaeologi
A. it occurred simultaneously.
B. it occurred at a time similar to noticeable cultural and social changes
C. there are no written records.
D. all of the above.

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[单项选择]A. Give his contribution some time later. B. Borrow some money from the woman.
C. Buy an expensive gift for Gemma. D. Take up a collection next week.

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[单项选择]You can take some time ______ the enclosed employee benefits information and then return it to the payroll department within two working days.
A. review
B. be reviewed
C. reviewing
D. to review

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