29． What does the Internet use to join the computers together?

A．Letters

B．E-mails

C．The box

D．The telephone

[单选题]29． What is from her mother?A．FlowersB．A sweaterC．A dressD．A computer

[单选题]29． — What should I do，doctor?—_________ healthy，you should take more exercise．A． KeepB． KeepingC．To keepD． Having kept

[单选题]29． What should the hackers know well， do you think， after you read this story?A． Information．B． Bank computer accounts．C． Computers．D． Grades．

[单选题]29． What's the purpose of the passage?A． To give some advice on how to lose weight．B． To advise people to eat apples every day．C． To tell people how to enjoy a better life．D． To advise people to give up bad habits．

[单选题]29． What changes have happened to some families?①There are lights at home．②People like to eat home-cooked food．③Lots of families have computers．④Lots of couples live apart because of unhappy problems．A．①②④B．②③④C．①②③D．①③④

[主观题]what is the use of a purifier ?explain the purpose of a gravity disc ?

[单选题]What does the author mainly discuss in the text?A． Technology. B. Sustainability.C． Ethanol energy. D. Environmental protection.

[单选题]29. If you don’t get enough sleep at night, you’ll have _____ energy the next day.A． fewerB. muchC. less D. more

[单选题]29．A．watchB．watchingC．watchsD．watches

[单选题]29．A．skateB．swimC．surfD．dance