单项选择题

We can infer that when Harrison succeeded in making his clock he was ______.

A．in his eighties
B．100 years old
C．twenty years old
D．a middle-aged man
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单项选择题
When Harrison's clock was first made,______.
A．it could tell the time at sea
B．it could tell sailors where they were
C．both A and B
D．every country in the world set the time by it besides A and B
单项选择题
Which of the statements is not true according to the passage
A．Placentia was the earliest palace with its windows made of glass in England.
B．The ships made at Greenwich are the best in the world.
C．Based on Flamsteed’s study Harrison made a clock.
D．Based on Flamsteed’s study, Harrison made a clock.
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