在数值上，一个数字周期等于一个码元所占的时间间隔。

作为检测二氧化硫等有毒气体的指示植物的是（　　）

A．病毒

B．藻类植物

C．蕨类植物

D．苔藓植物

凡未经技术业务训练和技术考核即被任职使用，造成严重不良后果的，只追究当事人的责任。

     Sydney is Australia's most exciting city. The history of Australia begins here. In 1788, Captain Arthur

Phillips arrived in Sydney with 11 ships and 1,024 passengers (including 770 prisoners) from Britain.

Today there are 2.5 million people in Sydney. It is the biggest city in Australia, and one of the most

beautiful cities in the world.

     There are over 20 fine beaches close to Sydney. Its warm summer climate and cool winter have made

it a favorite city for immigrants (移民) from overseas. There are three things that made Sydney famous-its beautiful harbor, the Sydney Harbor Bridge,and the Sydney Opera House.

But there are many more interesting things in Sydney: beautiful shops and restaurants, for example, rows

of interesting old houses built everywhere in the 19th century. Summer or winter, day or night, Sydney is

an outdoor city.

     Some Americans think it is very British. Some British visitors think it is like America. There is some

truth in both these opinions, because Sydney takes from both the Old World-Europe, and the New

World-America, and makes it into something that is neither British nor American but truly Australian.

1. Which of the following statements is true?

A. Sydney is a silent city.

B. Sydney is a busy city.

C. Sydney is a new city.

D. Sydney is a common city.

2. In 1788, Captain Arthur Phillips arrived in Sydney________.

A. with some ships and more than 1,000 passengers

B. with 11 ships and only 700 prisoners

C. with 1,024 passengers besides 700 prisoners

D. with only more than ten ships and some helpers

3. What made Sydney famous?

A. Three things-the beautiful harbor, the Sydney Harbor Bridge and the Sydney Opera House.

B. Immigrants from Britain, the beautiful Harbor and ships.

C. Beautiful shops, modern restaurants and interesting old houses and seas.

D. The Sydney Opera House, interesting old houses and interesting restaurants

4. The climate in Sydney is________.

A. hot in summer and cold in winter

B. warm all the year round

C. neither too hot nor too cold

D. cool all through the year

5. The writer thinks Sydney________.

A. is like America

B. is very British

C. is neither British nor American but truly Australian

D. takes from Europe

与其他管理理论相比，权变理论在研究管理问题时更加强调的条件是（）

A.环境条件

B.技术条件

C.内部条件

D.人员条件