在宏程序中，进行比较运算的时候，使用（）。 A.数学中的比较符号 B.使用计算机语言

商业银行的职能包括（）。

A.支付中介职能

B.信用中介职能

C.信用创造职能

D.金融服务职能

E.代理投资职能

设A、B均为n阶方阵，且AB=0，则下列（）项正确。

A．若R(A)=n，则B=0

B．若A≠0，则B=0

C．或者A=0，或者B=0

D．|A|+|B|=0

阅读理解。

     The 16-year-old girl Jessica Watson is said to be the youngest person to sail non-stop alone around the

world. But her record has been questioned because someone thought that she has not sailed far enough. She will also not be recognized by the World Speed Sailing Record Council, as it was too dangerous for someone under

18 years old.

     Ms Watson sailed into Sydney port on Saturday, seven months after leaving on a hard voyage. Family,

friends and Australian Prime Minister Kevin Rudd have gathered to greet her. Thousands of well-wishers

waited at the port and watched from boats as Ms Watson sailed her pink, 10m boat over the finishing line.

Many more Australians watched the event broadcast live on television. Watson said she was just an"ordinary

girl who believed in her dream".

     Ms Watson left Sydney on 18 October, despite that some people disagreed to her plan. Watson traveled

northeast through the South Pacific and across the equator (赤道), south to Cape Horn at the tip of South

America, across the Atlantic Ocean to South Africa, through the Indian Ocean and around southern Australia.

The route took her through some of the world's most changeful waters, and she battled through huge storms

and suffered seven accidents of her boat.

     People around the world have followed Ms Watson's adventures on her blog, which she has daily updated  (更新). On her blog, she wrote down beautiful sunrise over seas, the excitement of meeting a blue whale and

the bright, terrible sight of a shooting star flying across the night sky above her boat. Ms Watson has reportedly sold her story to a news company for $700,000. She is planning to write a book on her experience.

1. Which of the following oceans didn't Ms Watson cross through in her voyage?

A. The Pacific Ocean.

B. The Arctic Ocean.

C. The Indian Ocean.

D. The Atlantic Ocean.

2. Ms Watson's voyage will NOT be considered an official world record mainly because _______.

A. no one can prove that her route was dangerous enough

B. she hasn't applied for the record

C. teenagers are not encouraged to take such a dangerous adventure

D. girls are not allowed to take part in the dangerous sports

3. We can make a conclusion from this passage that Watson _______.

A. would make another voyage for money

B. made the world round voyage for money

C. had no way to communicate with others during the voyage.

D. is so confident and brave that she could overcome troubles on her own

4. All the following can be inferred from this passage EXCEPT that _______.

A. her book about her voyage is a best seller

B. people in Australia had much interest in her voyage

C. she spent more than 200 days alone at sea

D. people have different attitudes towards her voyage

服用下列哪种降糖药可能出现金属味等不良反应（）

A.二甲双胍

B.阿卡波糖

C.罗格列酮

D.瑞格列奈

E.格列齐特

拟阿脑虫病早期无明显症状，通过（）观察可作出早期诊断

A.水浸片

B.血涂片

C.肉眼

D.放大镜