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单选题
下列选项中属于字符串常量的是（ ）。
A
’abc’
B
”abe”
C
[abe]
D
（abe）
参考答案
参考解析
解析：
字符串是用双引号“”括起来的一个或多个字符。
字符串是用双引号“”括起来的一个或多个字符。
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考题
A young woman rode with her new husband in a wagon（四轮马车）.They came to a log cabin（小木屋）.The man shouted and a little boy came running out of the cabin.Sarah,the young woman,got down from the wagon,opened wide her arms and heldthe boy close.
"Hello,Abe Lincoln,"she said."I think we′ll be good friends."
The new mother with the smiling face went to work at once.She washed Abe and hissister and tidied（弄整齐）their hair.And that night she threw away the boy′s mattress（床垫）of leaves and gave him a soft mattress and enough blankets to keephim warm at night.
Sarah wove cloth and made new shirts for Abe.She made him new deerskin trousers and even deerskin shoes.
Maybe,if she hadn′t come to the cabin,he wouldn′t have lived to be a man.When Abe′s father told him not to go to school any more and help on the farm,Sarah took Abe′s part against his father.Abe would rather read than eat,and when hisfather told him to stop,Sarah said,"Let the boy read."
In 1830 the day came when Abe would leave home to work in New Salem.For the last time she had taken Abe′s part against his father.For the last time she had kept the cabin quiet so that Abe could read.More than twenty years later,when Abe,who had then become famous,was going to make a speech in a nearby town,Sarah went there just to watch him.In the crowd she tried to make herself small,but he saw her,and in front of everybody,got out of his carriage and went overand put his arms around her and kissed her.Yes,that was her Abe.
"Heloved me truly,"she said later.
Sarah said Abe loved her truly becauseA.Abe saw her in the crowd though she tried to make herself small
B.Abe didn't forget about his mother 20 years later
C.Abe kissed her in front of everybody
D.Abe said this to her himself
考题
A young woman rode with her new husband in a wagon（四轮马车）.They came to a log cabin（小木屋）.The man shouted and a little boy came running out of the cabin.Sarah,the young woman,got down from the wagon,opened wide her arms and heldthe boy close.
"Hello,Abe Lincoln,"she said."I think we′ll be good friends."
The new mother with the smiling face went to work at once.She washed Abe and hissister and tidied（弄整齐）their hair.And that night she threw away the boy′s mattress（床垫）of leaves and gave him a soft mattress and enough blankets to keephim warm at night.
Sarah wove cloth and made new shirts for Abe.She made him new deerskin trousers and even deerskin shoes.
Maybe,if she hadn′t come to the cabin,he wouldn′t have lived to be a man.When Abe′s father told him not to go to school any more and help on the farm,Sarah took Abe′s part against his father.Abe would rather read than eat,and when hisfather told him to stop,Sarah said,"Let the boy read."
In 1830 the day came when Abe would leave home to work in New Salem.For the last time she had taken Abe′s part against his father.For the last time she had kept the cabin quiet so that Abe could read.More than twenty years later,when Abe,who had then become famous,was going to make a speech in a nearby town,Sarah went there just to watch him.In the crowd she tried to make herself small,but he saw her,and in front of everybody,got out of his carriage and went overand put his arms around her and kissed her.Yes,that was her Abe.
"Heloved me truly,"she said later.
If Sarah hadn′t come to the cabin,A.Abe's father wouldn't have told him not to go to school
B.Abe wouldn't have helped his father on the farm
C.Abe wouldn't have had so much time to read
D.Abe's father wouldn't have told him to stop reading
考题
A young woman rode with her new husband in a wagon（四轮马车）.They came to a log cabin（小木屋）.The man shouted and a little boy came running out of the cabin.Sarah,the young woman,got down from the wagon,opened wide her arms and heldthe boy close.
"Hello,Abe Lincoln,"she said."I think we′ll be good friends."
The new mother with the smiling face went to work at once.She washed Abe and hissister and tidied（弄整齐）their hair.And that night she threw away the boy′s mattress（床垫）of leaves and gave him a soft mattress and enough blankets to keephim warm at night.
Sarah wove cloth and made new shirts for Abe.She made him new deerskin trousers and even deerskin shoes.
Maybe,if she hadn′t come to the cabin,he wouldn′t have lived to be a man.When Abe′s father told him not to go to school any more and help on the farm,Sarah took Abe′s part against his father.Abe would rather read than eat,and when hisfather told him to stop,Sarah said,"Let the boy read."
In 1830 the day came when Abe would leave home to work in New Salem.For the last time she had taken Abe′s part against his father.For the last time she had kept the cabin quiet so that Abe could read.More than twenty years later,when Abe,who had then become famous,was going to make a speech in a nearby town,Sarah went there just to watch him.In the crowd she tried to make herself small,but he saw her,and in front of everybody,got out of his carriage and went overand put his arms around her and kissed her.Yes,that was her Abe.
"Heloved me truly,"she said later.
Which of the following is not true?A.The young woman in the wagon was Abe's new mother.
B.The man in the wagon was Abe's new father.
C.The little boy was the young woman's new son.
D.The little boy running out of the cabin was Abe.
考题
某二倍体植物，其A/aB/bE/e三个基因位点的连锁关系如下：abe02050现有一基因型为Abe/aBE的植株，假定无干扰存在，该植株自交后代中基因型abe/abe的植株比例应该是（）。
考题
单选题下列选项中属于字符串常量的是（）A
’abc’B
abcC
（abc）D
{abc}
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