课时作业(三十四) [选修7 Unit 4 Sharing]
(限时：35分钟)
Ⅰ.单项填空
1．Warmblooded animals have the ability to ________ body heat exactly to maintain their ideal temperature despite changing weather.
A．respond B．attach
C．adjust D．expose
2．Your nationality is not ________when choosing a career，but your ability to speak the language is.
A．relative B．responsible
C．relevant D．practical
3．TVturnoff week，________millions of people around the world participate every year，tries to encourage people to turn on life.
A．in which B．on which
C．which D．when
4．With China ________ in the world trade more frequently，the world economy is developing more rapidly and steadily.
A．participating
B．to participate
C．participated
