铁路大桥的长度为( )米。
A. 100
B. 100—500
C. 500
D. 小于500米且大于等于100
I can _______ it.
A. understand
B. understood
C. understanding
D. understands
特大桥的长度为( )米。
A. 100
B. 100~500
C. 500
D. 大于等于500
You'd better make some Chinese ______.
A. friend
B. friends
C. friendly
D. friended