今日习题：
1．the goods were packed in( )of 50kgs net each．
a．ash content
b．hygiene
c．quality
d．gunny bags
2．it is an irrevocable( )which can not be changed．
a．letter of credit
b．bill 0f lading
c．quarantine
d．quality
3．the goods are now ready for( )．
a．wool
b．water proof
c．packing
d．virus
正确答案：
1．a
2．c
3．b
