-- Is air the lightest thing in the worl
题型:选择题
问题:
-- Is air the lightest thing in the world?
-- Not . Scientists from Zhejiang University have just developed the world’s lightest material.
A.now
B.yet
C.then
D.again
-- Is air the lightest thing in the world?
-- Not . Scientists from Zhejiang University have just developed the world’s lightest material.
A.now
B.yet
C.then
D.again