问题 多项选择题

下列关于联合查询语法格式的说法正确的有()。

A.选项[ALL]可以使输出结果保存全部行,忽略则自动删除重复行

B.结果集中的列名来自第一个查询语句

C.如果包含ORDERBY子句,将对最后的结果集排序

D.如果包含ORDERBY子句,将对最前的结果集排序

E.所有查询中的列名和列顺序必须完全相同

答案

参考答案:A, B, C, D

阅读理解

阅读理解。

     They're best friends. They go to school together every day. They often go to the shopping mall at

weekends. Both of them have hair the colour of honey (蜂蜜), but one has big blue eyes and the other deep

brown eyes.

     One of the friends, Jenny Siegle, is in a wheelchair. The other, Augie, is an amazing dog who helps Jenny.

Jenny, who is 14 years old, is a quadriplegic (四肢瘫痪者), which means she cannot use her arms or legs.

Augie is a Freedom Service dog who is Jenny's arms and legs.

     How does Augie do this? In school, he picks up the pencil or notebook that Jenny drops. Jenny is also

training Augie to pull off her jacket so Jenny doesn't have to ask anyone for help.

     At home, Augie brings her the newspapers. He even helps clean Jenny's room. When Jenny asks him.

Augie goes to get her parents or sister. Augie also carries his food dish back to Jenny so she can fill it with

dog food. Then Augie puts it back neatly in its place.

      At the mall, Augie wears a pack that tells everyone he is a Freedom Service dog. When Jenny wants to

buy things, Augie carries them to the counter (柜台). He gives the cashier Jenny's wallet and waits for the

change (找零).

      P. J. Roche, who started Freedom Service Dogs, says, "These dogs are a social bridge, Kids who don't

know Jenny come up to talk to her because she's got a dog." Augie is truly Jenny's best friend and helper

and her bridge to the world.

1. Augie is ___________.

A. a girl in a wheelchair

B. Roche's friend

C. a helpful dog

D. a cashier

2. Augie helps Jenny do many kinds of things except ___________.

A. helping her take off her clothes

B. carrying things to Jenny at home

C. paying money to the cashier at the mall

D. helping Jenny learn all kinds of things at school

3. "Augie is Jenny's bridge to the world" means that ___________.

A. it helps Jenny a lot in her life

B. it does everything it can for Jenny

C. it picks up things Jenny drops at school

D. children who don't know Jenny come to talk to her because of Augie

多项选择题