在美国南部等地发现的畸形蛙约占10%，致畸的原因最可能是 [ ]
A．空气污染
B．水域污染
C．土壤污染
D．人类捕杀
答案：B
She has lost her handbag with the _____ sum of $150 in it.
A．extraordinary
B．important
C．considerable
D．valuable
为什么胶粘剂称为“工业味素”？
