单项选择题

A．To check the accuracy of scales.
B．To calculate the density of other metals.
C．To observe changes in the atmosphere.
D．To measure amounts of rainfall.
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单项选择题
A．Kings and queens, princes and princesses, and lords and ladies built castles in order to get more land.B．Around the outside of a castle, a moat was dug, which was often filled with water.C．A castle was built behind a thick and high stonewall, which was strong enough to stand the possible attack of enemies.D．If a drawbridge was pulled up, there was no way for people to enter the castle.
A．Kings and queens, princes and princesses, and lords and ladies built castles in order to get more land.
B．Around the outside of a castle, a moat was dug, which was often filled with water.
C．A castle was built behind a thick and high stonewall, which was strong enough to stand the possible attack of enemies.
D．If a drawbridge was pulled up, there was no way for people to enter the castle.
单项选择题
A．On April 26, 1611.B．On April 23, 1611.C．On April 26, 1616.D．On April 23, 1616.
A．On April 26, 1611.
B．On April 23, 1611.
C．On April 26, 1616.
D．On April 23, 1616.
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