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问题 单项选择题

已知空白基质栓重2.og，鞣酸置换价为1.6。若制备每粒含鞣酸o.2g的栓剂100粒，则所需基质为（）

A.40.0g

B.160.0g

C.168.0g

D.180.0g

E.187.5g

答案

参考答案：E

阅读理解

Social networking isn’t only for the under 40s. More than 25 percent of Americans 50 years and older stay connected using sites such as Facebook, MySpace and Twitter, according to new research.

“The latest data tells us that more and more social networking is becoming a part of everyday life for Americans 50 plus,” said Kevin Donnellan, the chief communications officer at AARP, which released the report.

Nearly a quarter of older Americans are on Facebook and 73 percent said they use it to stay in touch with relatives, but not just their children and grandchildren. “They are using the Internet to keep up with the world and the people who are important to them,” said Jean Koppen, the author of the report. She added that older adults are also on Facebook to stay connected, not only with their family, but with their friends and those in the same age group. Almost 50 percent of older adults were introduced to the social networking sites by a family member, mainly a child or grandchild. “Just under one-fifth of adults aged 50 and older say they do not use the Internet,” according to the report.

The findings are based on a telephone survey of 1,863 adults. In addition to keeping up on Facebook and Twitter older adults are aware of the latest technology. Eighty-three percent had heard about the Apple iPad and 11 percent intended to buy one.

Despite the popularity of the Internet among the over 50s, they still mostly go to print newspapers and magazines for news. Only one percent said they followed blogs.

小题1:What is the main idea of the text?

A. Social networking is becoming popular among older Americans.

B. Social networking isn’t for the under 40s in the U.S.A.

C. American old people’s way of life is quite fashionable.

D. Facebook, MySpace and Twitter are the most popular websites in the US.

小题2:Which of the following statements is TRUE according to the passage?

A．85% of Americans 50 plus choose the Internet over print media.

B．About 20% of adults aged 50 plus have access to the Internet.

C．About 460 people in the telephone survey often use Facebook.

D．Three quarters of the people surveyed got to know the Internet through their family.小题3:From the text, it can be concluded that______.

A．Kevin Donnellan approves of this change among older Americans

B．many older Americans are open-minded about new developments

C．Young people should introduce their elders to new technology

D．In a high tech age it is difficult to avoid social networking小题4:Where does the text probably come from?

A．A novel.

B．A student’s research paper

C．A technology guide.

D．A newspaper.
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填空题

[说明]

某游戏公司现欲开发一款面向儿童的模拟游戏，该游戏主要模拟现实世界中各种鸭子的发声特征、飞行特征和外观特征。游戏需要模拟的鸭子种类及其特征如表下表所示。

为支持将来能够模拟更多种类鸭子的特征，采用策略设计模式(strategy)设计的类图如图5-1所示。

其中，Duck为抽象类，描述了抽象的鸭子，而类RubberDuck、MallardDuck、CottonDuck和RedHeadDuck分别描述具体的鸭子种类，方法fly()、quack()和display()分别表示不同种类的鸭子都具有飞行特征、发声特征和外观特征；类FlyBehavior与QuackBehavior为抽象类，分别用于表示抽象的飞行行为与发声行为；类FlyNoWay与FlyWithWings分别描述不能飞行的行为和用翅膀飞行的行为；类Quack、Squeak与QuackNoWay分别描述发出“嘎嘎”声的行为、发出橡皮与空气摩擦声的行为与不发声的行为。请填补以下代码中的空缺。

[C++代码]

# include＜iostream＞

using namespace (1) ;

class FlyBehavior

public : (2) fly()=0；

;

class QuackBehavior

public: (3) quack()=0;

Class FlyWithWings :public F1yBehavior

public: void fly()cout＜＜"使用翅膀飞行!"＜＜endl;

;

class FlyNoWay :public FlyBehavior

public: void fly()cout＜＜"不能飞行!"＞＞endl;

;

class Quack :public QuackBehavior

public: void quack()cout＜＜"发出＼’嘎嘎’＼声!"＜＜endl;

;

class Squeak :public QuackBehavior

public: void quack()cout＜＜"发出空气与橡皮摩擦声!"＜＜endl;

;

class QuackNOWay :public QuackBehaVior

public: void quack()cout＜＜"不能发声!"＜＜endl;

;

C1ass Duck

protected:

FlyBehavior * (4) ;

QuackBehaVior * (5) ;

public:

VOid fly() (6) ;

VOid quack() (7) ; ;

virtual void display()=0;

;

class RubberDuck: public Duck

public:

RubberDuck()

flyBehavior=new (8) ;

quackBehavior=new (9) ;

～RubberDuck()

if (!flyBehavior) delete flyBehaVior;

i f(!quackBehavior)delete quackBehavior；

Void display() /*此处省略显示橡皮鸭的代码*/

//其他代码省略

（9）处填（）。
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