阅读理解。
On Christmas Eve-the night before Christmas Day-children all over Britain put a stocking at the end of
their beds before they go to sleep. Their parents usually tell them that Father Christmas will come during the
night.
Father Christmas is very kind and hearted. He gets to the top of each house and climbs down the chimney
into the fireplace. He fills each of the stockings with Christmas presents.
Of course, Father Christmas isn't real. In Jim and Kate's house, "Father Christmas" is really Mr. Green. Mr.
Green doesn't climb down the chimney. He waits until the children are asleep. Then he quietly goes into their
bedrooms and fills their stockings with small presents. When they were very young, Mr. Green sometimes
wore a red coat. But he doesn't do that now. The children are no longer young, and they know who "Father
Christmas" really is. But they still put their stockings at the end of their beds.
1. Christmas Eve is _____.[ ]
A. the night of Christmas Day
B. the evening of Christmas Day
C. Christmas Day
D. the night before Christmas Day
2. Father Christmas often puts presents _____. [ ]
A. into children's hats
B. into children's stockings
C. under children's beds
D. into children's shoes
3. When the children were very young, _____. [ ]
A. they didn't know who Father Christmas was
B. they knew that Father Christmas wasn't real
C. they thought their father was Father Christmas
D. they knew who put the presents into their stockings
4. When the children are older, they _____.[ ]
A. know that Father Christmas is real
B. ask their mother to fill their stockings with presents
C. know that Father Christmas is really their father
D. know that Father Christmas is really their friend
5. Father Christmas comes into the house through the _____. [ ]
A. chimney
B. back door
C. front door
D. window
，副线圈的频率等于原线圈的频率为f=1÷0.02=50hz，故AD错误，BC正确。