前人谓呕吐是指
A．胀满疼痛，攻窜不定B．胀满疼痛，腹痛拒按C．腹部刺痛，固定不移D．腹部胀痛，嗳腐吞酸E．腹痛喜按，得温则减
参考答案：B
从理论上说，金融期货交易中双方潜在的盈利和亏损都是无限的。( )
When the soldier _____ his shirt, he discovered that his arms were black and blue.
A．took on
B．took over
C．took in
D．took off
