1 . Once, when trying a certain trick on the beam (横杆), I fell onto the stones, damaging a nerve in my hand, and Toby came over, helping me up: Safe, man. Safe.

A．意志力

B．神经

C．鲁莽

2 . Indeed, by ________ estimates, there may be as many as 40 million stray dogs in China, carrying disease or becoming aggressive and attacking ________.

A．tough, passers-by	B．rough, passers-by
C．tough, passer-bys	D．rough, passer-bys

3 . Now, reduced energy supplies have led to more________ in the technology of new energy vehicles.

A．advances

B．traditions

C．behaviors

D．examples