问题 选择题

尖尾雨燕飞行速度最快可达352千米/小时,堪称飞得最快的鸟。下列关于雨燕与飞行生活相适应的结构特征中,不正确的是

A.身体呈流线型

B.食量大,直肠发达

C.长骨中空

D.胸肌发达

答案

答案:B

题目分析:鸟类有许多地方适于其在空中飞行:1、鸟的身体呈流线型,体表被有羽毛,这样可以减少空气阻力.前肢特化成翼,宽大的翼又增加了飞行的升力,所以,鸟类可以不用扇动翅膀就可以滑翔很远的距离.2、鸟的骨胳中空,重量很轻,骨骼有愈合较快的现象,以支撑发达的肌肉;鸟直肠很短而且不储存粪便,可以减轻身体的重量.3、鸟类不仅有肺而且有气囊,双重呼吸提高呼吸的效率,可以提供充足的氧气,产生大量的热能适应飞行的需要.鸟类的胸肌特别发达,可以有力地带动翅膀扇动,提供强大的动力.4、鸟的食量特别大,可以保证飞行时能量的供应.鸟类的循环系统发达,供血充足,可以保证肌肉中氧气和能量的供应.所以 直肠发达不准确,应为直肠很短.故选:B

完形填空

Kids in the Kitchen

Some experts serve up some of the factors that make cooking with kids a pleasure rather than a struggle.

__小题1: 

For obvious reasons, a grown-up needs to be in charge of the stove, sharp knives and electrical equipment.Dr.Colker advises parents to be watchful, even when their kids are involved in relatively safe tasks.The bottom line is to stay close by, and teach your kids to respect basic safety rules.

Leave Time

__小题2:  When kids help, you’ll need extra time to teach them some skills.When  you're in a hurry, give your kids tasks that don't require much guidance.As they get  older and develop more skills, they will become wonderful helpers and even save your  time!                                                                                           

Go for Variety                                                                                    

Our experts agree that children can enjoy more than the usual "kid food", such as chicken nuggets and pizza.__小题3:  Sandra K.Nissenberg suggests exploring the produce passage in the supermarket and talking about the unusual fruits and vegetables you find.

Involve Kids in Clean-up and Table-setting

Dr.Laura Colker reminds parents that preschoolers are eager to deal with grown-up tasks.They actually "enjoy the clean-up and table-setting activities", she says.__小题4:__

They may also enjoy setting the table and counting the spoons.

Make Cooking a Learning Adventure

Cooking helps kids develop a healthy interest in the lifelong challenge of eating nourishing(有营养的), delicious meals.Kids learn about science when they heat or cool a mixture and observe how it changes. 小题5:  And as they wait for the timer to ring, they develop a better understanding of the concept of time

A.Most young children can easily handle simple kitchen equipment

B.Cooking with young children requires patience.

C.Measuring ingredients teaches kids about fractions(分数).

D.Kids can and should help wash and dry the pots and pans.E.Keep an Eye on Safety

F.Stay Equipped

G.To introduce new foods, involve your kids in menu planning and shopping

解答题