问题 选择题

在其他条件相同的情况下,干树枝比湿树枝更容易被点燃,其原因是(  )

A.干树枝的着火点比湿树枝的着火点低

B.干树枝的着火点比湿树枝的着火点高

C.湿树枝所含的水降低了温度,使之不容易达到着火点

D.湿树枝没有接触到足够的氧气

答案

在其他条件相同的情况下,干树枝比湿树枝更容易被点燃,是因为湿树枝所含的水加热时蒸发带走了热量,使之温度不容易达到着火点.

故选:C

阅读理解

阅读理解。

     People all over the world write to Big Ben.  They even send birthday presents. Big Ben is not a person

n.  It's a clock.

     Big Ben is the great clock hanging up in a tower of the parliament building.  The people of London like

to see Big Ben's four friendly faces.They like to hear the bell striking (敲) on the hour. Bong! Bong! Bong!

     Big Ben's story started in 1834. In that year the old parliament building was burned down.  Its clock

tower fell to the ground.  There had to be a new building and a new clock.

     Plans were made.  They called for a "King of Clock, the biggest and the best in the world".  So the

clock had to be big.  And it had to keep very good time.

     In two years the big clock'was made.Five more years went by before the clock tower was last finished

d.  Then the four bells for the chimes (鸣响) were brought into the tower.  And at last the big hour bell

was put in place.  It rang out for the first time on July llth,  1859.

     This great bell had to have a name.  A meeting of parliament was called to pick one.  "This clock is the king of clocks," one man said,  "Let's call the bell the Queen of Bells. "

   "Then why not Victoria?" said another (Victoria was the British queen at that time),  The talk about names went on and on.  Then Benjamin Hall got up to speak. He was a big man.  By this time they were all tired.  Someone shouted, “Why not call it Big Ben and be done with it?"

      Everybody laughed, and the meeting was over.  But it was called Big Ben from then on.  Not just the

bell but the whole clock..

1,In 1834, _______.

A. people finished the clock tower

B.people sold the clock tower

C.the clock tower broke down

2.Big Ben is the name ofa .

A. building

B. clock

C. beautifulgirl

3.It tookto build the clock tower_______.

A. seven years

B. five years

C. two years

4.Victoria might be the British queen_______.

A.in 1583

B.in 1768

C.in 1863

5.The best title for this passage is_______.

A.Why Big Ben Is So Big

B. British Parliament Building

C.How Big Ben Got Its Name

单项选择题 B1型题