1.China ________ great importance to the ties with Germany,a

1.China ________ great importance to the ties with Germany,and always develops relation with Germany under the Five principles of peaceful coexistence.
A.plays
B.attaches
C.underlines
D.stresses
2.Human skin is highly ________ to the change of the outside air temperature.
A.particular
B.keen
C.sensible
D.sensitive
3.________ from space,the earth,with water _______ seventy percent of its surface,looks like a blue ball.
A.Seen；covered
B.Seen；covering
C.Seeing；covering
D.Seeing；covered