What happens during the natural growth of a tree each year?
A.Their rings become lighter in color.
B.They have one more ring of wood.
C.They become more precious.
D.Their rings get closer and closer.
第1题
What did Daniel Hayes invent?
A.A single-engine fire truck.
B.A water-powered fire truck.
C.A record player.
D.A circular ladder holder.
请帮忙给出正确答案和分析,谢谢!
第2题
What was used to power the water pump on the Joe Ross?
A.Gas.
B.Horses.
C.Steam motor.
D.Oil motor.
请帮忙给出正确答案和分析,谢谢!
第3题
What is the tour for today mainly about?
A.Urban fire fighting.
B.American fire fighting innovations.
C.The history of fire.
D.The Great San Francisco Fire fighting.
请帮忙给出正确答案和分析,谢谢!
第4题
What is the passages main idea?
A.Thousands of people were punished because of salt.
B.The uses and importance of salt in history.
C.Salt was important in history.
D.Nobody knows when salt began to be used.
请帮忙给出正确答案和分析,谢谢!
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