It is well known to all that the kilogram is the international         of weight.
#27845
A
position
B
condition
C
conference
D
standard
推荐题目
I have some _________ in working out the problem.
#27940
A
difficulty
B
difficulties
C
troubles
D
difficult
Look! There are some______ on the table.
#27874
A
tomatoes
B
camera
C
watchs
D
sausage
----How many foreign workers are there in your company?----There are five, three _______ and two _______.
#28894
A
German; Frenchman
B
Germans; Frenchmen
C
Germany; French
D
Germany; Frenchmen