1 . It is believed that travelling to Yaan in October is enjoyable experience.

A．/; the	B．the; an
C．/; an	D．the, the

2 . .There are over 58,000 rocky objects in________ space, about 900 of which could fall down onto_______earth.

A．the; the

B．不填;the

C．the;不填

D．a; the