问题 填空题

右侧是模拟呼吸的试验装置,根据图回答问题.

(1)图中①表示的是______,②表示的是______③表示的是______

(2)图______表示呼气,此时胸

廓的容积______,肺受到的压力______膈肌处于______状态.

答案

(1)图中①玻璃管代表的是气管,②代表支气管,③小气球代表的是肺,⑤橡皮膜代表的是膈肌;④钟罩代表的是胸廓.

(2)吸气过程.吸气时,膈肌与肋间肌收缩,引起胸腔前后、左右及上下径均增大,胸廓的容积扩大,肺随之扩张,造成肺内气压减小,小于外界大气压,外界气体进入肺内,形成主动的吸气运动;当膈肌和肋间外肌舒张时,肋骨与胸骨因本身重力及弹性而回位,结果胸廓容积缩小,肺也随之回缩,造成肺内气压大于外界气压,肺内气体排出肺,形成被动的呼气运动.图中A膈肌顶部升高,肺缩小,表示呼气,图中B膈肌顶部下降,肺扩张,表示吸气.

故答案为:

(1)气管;支气管;肺

(2)A;缩小;大;舒张

判断题
阅读理解

Tourism probably started in Roman times.Rich Romans visited friends and family who were working in another part of the Roman empire.But when the empire broke down, this kind of tourism stopped.

In the early 17th century, the idea of the “Grand Tour” was born.Rich young English people sailed across the English Channel(英吉利海峡).They visited the most beautiful and important European cities of the time, including Paris in France, and Rome and Venice(威尼斯)in Italy.Their tours lasted for two to four years, and the tourists stayed a few weeks or months in each city.The “Grand Tour” was an important part of young people’s education—but only for the rich.

In the 18th century, tourism began to change.For example, people in the UK started to visit some towns, such as Bath to “take the waters”.They believed that the water there was good for their health.So large and expensive hotels were built in these towns.

In the 19th century, travel became much more popular and faster.When the first railways were built in the 1820s, it was easier for people to travel between towns, so they started to go for holidays by the sea.And some started to have holidays in the countryside as cities became larger, noisier and dirtier.

Traveling by sea also became faster and safer when the first steamships were built.People began to travel more to far-away countries.

The 20th century saw cars become more and more popular among ordinary people.Planes were made larger, so ticket prices dropped and more people used them.

Thus tourism grew.In 1949, Russian journalist Vladimir Raitz started a company called Horizon Holidays.The company organizes everything—plane tickets, hotel rooms, even food—and tourists pay for it all before they leave home.The package tour and modern tourist industry was born.

The first travel agency in China was set up as early as 1949.But tourism did not take off until 1978.In 2002, the industry was worth 500 billion Yuan and became an important part of China’s social development.

小题1:In the early times, the travelers __________.

A.all came from Roman

B.had lots of money

C.were very young and strong

D.traveled by boat小题2:Which of the following is true?

A.The young men learned little from Grand Tour.

B.Tourism became faster and safer when the first railways were built in the 18th century.

C.More people chose planes for its cheap price.

D.In 2002, tourism became a significant part of China’s social development.小题3:_________played the most important role in the tourism development.

A.Education

B.Transportation

C.Money

D.People’s ideas小题4:Modern tourism was born ___________.

A.in 1978

B.in Roman times

C.in the early 17th century

D.in 1949