在铸件内部或表面有大小不等的光滑孔洞的铸件缺陷被称为（）。
参考答案：气孔
因为期货价格与现货价格的变动方向一致，所以基差在合约到期之前是不变的。（）
________ information! I hear you have finished writing a ________ report.
A．What an excited; seven thousand word’s
B．What excited; seven thousand words
C．What an exciting; seven-thousand-word
D．What exciting; seven-thousand-word
