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

A．/; the	B．the; an
C．/; an	D．the, the

2 . I took ______ possession of the house in 1970, but now it is in ______ possession of an old man.

A．/; the

B．the; the

C．/; /

D．a; a

3 . .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

4 . I’d like to use reference book, but the book I want to make use of is intended for beginners only.

A．a; the

B．/; the

C．the; a

D．a; /