单选题Seven years ago, Scott was 3 times as old as Kathy was at that time. If Scott is now 5 years older than Kathy, how old is Scott ?A 12.5B 13C 14D 14.5

题目
单选题
Seven years ago, Scott was 3 times as old as Kathy was at that time. If Scott is now 5 years older than Kathy, how old is Scott ?
A

12.5

B

13

C

14

D

14.5

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更多“单选题Seven years ago, Scott was 3 times as old as Kathy was at that time. If Scott is now 5 years older than Kathy, how old is Scott ?A 12.5B 13C 14D 14.5”相关问题

  • 第1题：

    There used to be an old city here, which was ()under the river about 2000 years ago.

    A、insulted

    B、insulated

    C、buried

    D、interrupted


    参考答案：B

  • 第2题：

    The manager is 40 years old,(用how old对划线部分提问)


    参考答案How old is the manager?

  • 第3题：

    YousettheundopoolresourceplandirectivefortheconsumergroupnamedDSS_USERSthatisassignedtotheDAY_SHIFTplan.Thedatabaseusers，SCOTTandBLAKE，belongtotheDSS_USERSresourcegroup.Theuser，SCOTT，initiatesadatabasesessionandexecutesabatchoperationthatinsertsmillionsofrowsintotheHISTORYtable.WhichtwooptionsaretrueifthetotalundospaceallocatedtotheDSS_USERSgroupexceedsthevaluespecifiedintheundopoolresourceplandirective？（）

    A.Thebatchoperationstartedbytheuser，SCOTT，terminateswithanerror.

    B.Thebatchoperationstartedbytheuser，SCOTT，hangsandyouarerequiredtoincreasetheundopoolresourceplandirective.

    C.Thebatchoperationstartedbytheuser，SCOTT，runsuninterruptedbecausethedatabaseusestheSYSTEMtablespacefortheundooperation.

    D.Theuser，BLAKE，cannotstartatransactionthatusesanyDMLoperationsuntilyouincreasethevalueoftheundopoolresourceplandirective.

    E.TheuserBLAKEcanstartatransactionthatusesanyDMLoperationsafterthebatchoperationstartedbytheuser，SCOTT，terminateswithanerror.


    参考答案：A, D

  • 第4题：

    No one can expect to fully enjoy the adulthood privileges until he is ________.

    [A] eleven years old

    [B] sixteen years old

    [C] twenty-one years old

    [D] between twelve and twenty-one years old


    正确答案：C
    43.[C] 意为：21岁第二段后面部分从 It is during the nine years 到倒数第二句列举了青春期各阶段的权利。其中，第十句（at the age of twenty-one… public office）指出，21岁是开始享有完全成人权利的年龄。所以[C]为正确选项。
    11 岁不属于该部分介绍的范围；16岁时只能享有部分成人权利；12到 21岁期间是一个从儿童向成人转变的过程，个人享有权利逐渐增加，但若享有完全成人权利，需要达到 21岁。因此其他项排除。

  • 第5题：

    授予sa用户在SCOTT.EMP表中SAL列的更新权限的语句是（）。

    • A、GRANT CHANGE ON SCOTT.EMP TO SA
    • B、GRANT UPDATE ON SCOTT.EMP（SAL） TO SA
    • C、GRANT UPDATE （SAL） ON SCOTT.EMP TO SA
    • D、GRANT MODIFY ON SCOTT.EMP（SAL） TO SA

    正确答案:B

  • 第6题：

    The user SCOTT executes the following command successfully to increase the salary values in one of his sessions：  SQL> UPDATE emp SET sal=sal*1.15 WHERE deptno=20；  Before SCOTT ends the transaction， user HR who has the privileges on EMP table executes a query to fetch the salary details but finds the old salary values instead of the increased values. Why does HR still see the old data？（）

    • A、because of redo data from redo log file
    • B、because of data from database buffer cache
    • C、because of data from a temporary tablespace
    • D、because of undo data from the undo tablespace

    正确答案:D

  • 第7题：

    单选题
    As they are retired, Mr. and Mrs. Scott prefer a house in the country to _____ their remaining years there.
    A

    spend

    B

    spending

    C

    spent

    D

    spends


    正确答案： A
    解析：

  • 第8题：

    单选题
    What will be the result of using the SQL> DROP USER SCOTT CASCADE； command？（）
    A

     The user， Scott， is dropped， all the objects in Scott’s schema are placed in the Recycle Bin， and the objects that are  already in the Recycle Bin are dropped.

    B

     The user， Scott， is dropped， all the objects in Scott’s schema are placed in the Recycle Bin， and all the objects in the Recycle Bin， belonging to the user Scott， are not dropped.

    C

     The user， Scott， is dropped， all the objects in the Scott’s schema are not placed in the Recycle Bin， and the objects in the Recycle Bin， belonging to the user， Scott， are not dropped.

    D

     The user， Scott， is dropped， all the objects in Scott’s schema are not placed in the Recycle Bin， and the objects in the Recycle Bin are dropped.


    正确答案： D
    解析： 暂无解析

  • 第9题：

    问答题
    When David is twice as old as he is now he will be four times as old as his daughter Jane will be in five years time. If in 1990, four years ago, he was four times as old as his daughter, in what year was she born?

    正确答案： In 1983
    解析：
    （由题目可知，四年前为1990年，则今年为1994年。可以设David的女儿今年为X岁，David为Y岁，根据题目条件可以列出一个两元一次方程组：4(X+5)=2Y; 4(X-4)=Y-4。解方程组可得：X=11，Y=32，即Jane今年11岁，又知今年为1994年，则1994-11=1983，即她出生于1983年。）

  • 第10题：

    单选题
    授予sa用户在SCOTT.EMP表中SAL列的更新权限的语句是（）。
    A

    GRANT CHANGE ON SCOTT.EMP TO SA

    B

    GRANT UPDATE ON SCOTT.EMP（SAL） TO SA

    C

    GRANT UPDATE （SAL） ON SCOTT.EMP TO SA

    D

    GRANT MODIFY ON SCOTT.EMP（SAL） TO SA


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    Seven years ago, Scott was 3 times as old as Kathy was at that time. If Scott is now 5 years older than Kathy, how old is Scott ?
    A

    12.5

    B

    13

    C

    14

    D

    14.5


    正确答案： C
    解析：
    这是一道稍复杂的计算题，设Scott七年前的年龄为X，则有X+7-（1/3X+7）=5，由此可得X=7 1/2，再加上7即是Scott现在的年龄，因此该选14.5。

  • 第12题：

    单选题
    The user SCOTT executes the following command successfully to increase the salary values in one of his sessions：  SQL> UPDATE emp SET sal=sal*1.15 WHERE deptno=20；  Before SCOTT ends the transaction， user HR who has the privileges on EMP table executes a query to fetch the salary details but finds the old salary values instead of the increased values. Why does HR still see the old data？（）
    A

    because of redo data from redo log file

    B

    because of data from database buffer cache

    C

    because of data from a temporary tablespace

    D

    because of undo data from the undo tablespace


    正确答案： D
    解析： 暂无解析

  • 第13题：

    一 How old are these students? They are about 16 years old.

    A.Right

    B.Wrong


    参考答案：A

  • 第14题：

    He is_______ than I.

    A.elder three years

    B.old three years

    C.three years elder

    D.three years older


    参考答案：D

  • 第15题：

    授予sa用户在SCOTT.EMP表中SAL列的更新权限的语句是()。

    A.GRANT CHANGE ON SCOTT.EMP TO SA

    B.GRANT UPDATE ON SCOTT.EMP（SAL） TO SA

    C.GRANT UPDATE （SAL） ON SCOTT.EMP TO SA

    D.GRANT MODIFY ON SCOTT.EMP（SAL） TO SA


    参考答案：B

  • 第16题：

    Our factory is much more productive now. This year’s production is five times as much （） it was ten years ago.

    • A、what
    • B、as
    • C、that
    • D、than

    正确答案:B

  • 第17题：

    What will be the result of using the SQL> DROP USER SCOTT CASCADE； command？（）

    • A、 The user， Scott， is dropped， all the objects in Scott’s schema are placed in the Recycle Bin， and the objects that are  already in the Recycle Bin are dropped.
    • B、 The user， Scott， is dropped， all the objects in Scott’s schema are placed in the Recycle Bin， and all the objects in the Recycle Bin， belonging to the user Scott， are not dropped.
    • C、 The user， Scott， is dropped， all the objects in the Scott’s schema are not placed in the Recycle Bin， and the objects in the Recycle Bin， belonging to the user， Scott， are not dropped.
    • D、 The user， Scott， is dropped， all the objects in Scott’s schema are not placed in the Recycle Bin， and the objects in the Recycle Bin are dropped.

    正确答案:D

  • 第18题：

    问答题
    The combined ages of Frasier and Niles is 88 years; the combined ages of Niles and Daphne is 76 years; the combined ages of Frasier and Daphne is 80 years. Then, how old is Frasier?

    正确答案： 46 years old.
    解析：
    设Frasier的年龄为X，Niles 的年龄为Y，Daphne的年龄为Z；故可得出方程式如下：
    　　X+Y=88, Y+Z=76, X+Z=80；求解可得出X=46。

  • 第19题：

    问答题
    Helen is twenty years old, and her age is four times as much as Mary’s. When Helen’s age is twice as much as Mary’s, how old is Helen then?

    正确答案： Thirty years old
    解析：
    海伦20岁了，他的年龄是玛丽年龄的4陪，由此可知玛丽的年龄是5岁。设ⅹ年后海伦的年龄是玛丽年龄的2倍，则20+ⅹ=2（5+ⅹ），得ⅹ=10。十年后玛丽的年龄为30岁。

  • 第20题：

    单选题
    You want to enable the user， Scott， to change to the GRP1 consumer group by issuing the following code：        SQL> EXEC DBMS_SESSION.SWITCH_CURRENT_CONSUMER_GROUP  （’SCOTT’，       ’GRP1’， FALSE）；   How will you grant the switch privilege to the user， Scott？（）
    A

     by using the DBMS_SESSION package

    B

     by granting the DBA role

    C

     by using the DBMS_RESOURCE_MANAGER package

    D

     by using the DBMS_RESOURCE_MANAGER_PRIVS package


    正确答案： D
    解析： 暂无解析

  • 第21题：

    多选题
    You executed the following command to drop a user：   DROP USER scott CASCADE；   Which two statements regarding the above command are correct？（）
    A

    All the objects of scott are moved to the Recycle Bin.

    B

    Any objects in the Recycle Bin belonging to scott are purged.

    C

    All the objects owned by scott are permanently dropped from the database.

    D

    All the objects of scott in the Recycle Bin must be purged before executing the DROP command.

    E

    Any objects in the Recycle Bin belonging to scott will not be affected by the above DROP command.


    正确答案： E,C
    解析： 暂无解析

  • 第22题：

    问答题
    In what year was Edward born?　　(1) In 1988, Edward turned 17 years old.　　(2) Edward’s sister Lisa, who is 14 months older than Edward, was born in 1970.

    正确答案： A
    解析：
    由条件1可知，Edward出生于1971年；条件2无法计算Edward出生的日子，故本题选Ａ项。

  • 第23题：

    问答题
    A man is 36 years old. He asks the other man how old he is. The other man answers: “I am twice as old as you were when I was as old as you are today.” How old is the other man?

    正确答案： 48
    解析： 解答本题需要理解“I am twice as old as you were when I was as old as you are today.”，意思为：B男在A男这个年纪（36）时，B男年龄是当时A男年龄的两倍，假设B男年龄为x，则x=[36-(x-36)]*2=x,故x=48。

  • 第24题：

    问答题
    Four years ago, Jane was twice as old as Sam. Four years on from now, Sam will be 3/4 of Jane's age. How old is Jane now?

    正确答案： 12.
    解析：
    设Sam四年前为x，则Jane是2x，x+8=3/4(2x+8)，x=4，所以四年前Sam 4岁，Jane 8岁，现在Jane是12岁。

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