The lifts in ancient Rome.

• A、had a closed structure
  
  

• B、had a complicated design
  
  

• C、were used in agriculture
  
  

• D、were powered by steam
  
  

四、填句补文:第26一30题，每题2分，共10分。

下面的短文有五处空白，短文后有六个句子，其中五个取自短文，请根据短文内容将其分别放回原有位置，以恢复文章原貌，并在“非选择题”答题区内作答。

How to Help Teens Lose Weight

Teenage obesity(肥胖) is an increasing problem in the United States.  26 These teens run a higher risk of health problems as well as social problems.If your teen is overweight and expresses a desire to lose weight , help him do so in a healthy and safe manner.

Go to your teen's doctor to discuss a realistic weight-loss goal._27  Even if your teen is overweight , you should not make any big changes to physical activity or diet without his doctor's agreement.

Change your own behavior.If you are engaged in unhealthy habits ,you're sending the message to your teen that it's OK for him to follow suit.If you and your teen follow a healthy diet and an exercise plan together , you'll provide each other with the motivation and encouragement.  28  Let him know you are willing to help him.

Encourage your teen to exercise for at least 60 minutes a day.Choose a fun activity you might be able to enjoy together._  29  If he chooses an activity he thinks he'll enjoy , he'll be more likely to keep it.

Ensure a healthy diet for your entire family.Your teen won't feel like he's missing out if you're all eating the same types of foods.Discourage your family from drinking sugary drinks._30   If you must eat out ,choose the healthiest possible options (选项)。

A. Avoid eating fast foods.

B. Talk to your teen about his weight.

c. Suggest that your teen should go to bed early.

D. The number of obese teens amounts to 18% in 2010.

E. Most doctors say teens are still growing and should not diet.

F. Or, ask him if he might be interested in taking a class such as dance.

During the Industrial Revolution, lifts were.

• A、widely used in tall buildings
  
  

• B、powered by a hydraulic system
  
  

• C、rarely used in factories and mines
  
  

• D、independent of the public water system