[单项选择]The oldest documented age for a redwood tree is approximately ______


A. 350 years
B. 400 years
C. 800 years
D. 2,000 years

[单项选择]The caretaker knew the age of the tree by asking some old people.

[单项选择]The oldest newspaper in Australia is

[单项选择]The Victorian Age was largely an age of

[单项选择]The oldest preserved manuscripts are those written on papyrus, which were found in Egyptian tombs.
A. protected
B. hidden
C. sought
D. discovered

[单项选择]The American Constitution, the oldest written one in the world, started to take effect in
A. 1736.
B. 1789.
C. 1798.
D. 1769.

[单项选择]

Passage Two
The modern age is an age of electricity. People are so used to electric lights, radios, televisions, and telephones that it is hard to imagine what life would be like without them. When there is a power failure, people grope about in fickering candlelight, cars hesitate in the streets because there are no traffic lights to guide them, and food spoils in silent refrigerators.
Yet, people began to understand how electricity works only a little more than two centuries ago. Nature has apparently been experimenting in this field for millions of years. Scientists are discovering more and more that the living world may hold many interesting secrets of electricity that could benefit humanity.
All living cells sent out tiny pulses of electricity. As the heart beats, it sends off pulses of electricity that can be measured and recorded at the surface of the body. When the pulses are recorded, they form an electrocardiogram, which a doctor can study
A. 1,000.
B. 800.
C. 200.
D. 120.