A．Tian only practised at school.

　　B．Tian only practised during her vacations.

　　C．Tian rested only one day during the Spring Festival.

　　D．Tian insisted on practice no matter what kind of situation it was.

　　19．What can we infer from the ninth paragraph?

　　A．Tian was badly hurt.

　　B．Tian lost consciousness.

　　C．Tian is very strong and brave.

　　D．Tian's coach helped her.

　　20．What can we learn from the last paragraph but one?

　　A．Tian's headmaster and teachers all support her.

　　B．Tian often hands in her homework by the Internet.

　　C．Tian finishes her homework by the Internet.

　　D．Tian can't finish her homework because of her competition.

　　B

　　If you've ever seen the way people interacted with their pets, it comes as no surprise that there's some germ－est single contributors to what kinds of microbes that live on your skin.

　　A team of researchers led by Se Jinsong at the University of Colorado, Boulder, took swabs(化验标本) of the tongues, palms, foreheads and feces(排泄物) of members of 60 family households. Some of the families had children or household pets and some did not; dogs were the only pets swabbed.family members who lived together had more bacteria in common than members of separate households. Bacteria on the skin were especially similar within households, probably because we pass microbes through the air, through direct contact, and via the surfaces we touch.

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