单项选择题

What did Moss Brown do

A．He sold English goods in Rhode Island.
B．He drew designs of English machines for Samuel Slater.
C．he opened a mill in Rhode Island with Samuel Slater.
D．He left his native English to start a manufacturing business in the United States.

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单项选择题

What does a sundial measure according to the' passage

A．It measures the length of a day and a night.
B．It measures the movement of the sun each day.
C．It measures the passing of hours, minutes and perhaps seconds.
D．It measures the shadow of the stick across the flat surface of the sundial.

单项选择题

How many kinds of devices are mentioned in the passage which can measure time

A．3.
B．4.
C．5.
D．6.