__________ sleep every night is important for teenagers. _________, loss of sleep can make you feel tired, and even cause you to put on weight.

A．A good amount of; As a matter of fact

B．A good number of; In truth

C．A large amount of; As matter of fact

D．Plenty of; In a fact

创伤性动脉瘤的好发部位是

A．升主动脉

B．降主动脉远端

C．主动脉窦

D．主动脉弓

E．主动脉弓与降主动脉近端之间