In _____ preparation for the launching of Shenzhou Ⅶ, scientists need ______ knowledge of weather changes.

A．the; the     B．a; ∕         C．∕; a    D．the; a

In _____ preparation for the launching of Shenzhou Ⅶ, scientists need ______ knowledge of weather changes.

A．the; the B．a; ∕   C．∕; a    D．the; a

In _____ preparation for the launching of Shenzhou Ⅶ, scientists need ______ knowledge of weather changes.

A．the; the　　 B．a; ∕　 　　 C．∕; a　　　 D．the; a

In ______ preparation for the launching of Shenzhou Ⅶ, scientists need ______ knowledge of weather changes.

1. A.
   the; the
2. B.
   a; ∕
3. C.
   ∕; a
4. D.
   the; a

In______ preparation for the launching of Shenzhou VII, 4、scientists need______knowledge of weather changes.

1. A.
   the; the
2. B.
   a; /
3. C.
   /; a
4. D.
   the; a