（）是指期权的买方具有在约定期限内按协议价格卖出一定数量的金融资产的权利。
A.卖出期权
B.欧式期权
C.看跌期权
D.看涨期权
参考答案：C
The students in the international school are encouraged to voice whatever opinions they have and
question authority, which helps to develop their______ thinking. [ ]
A. cautious
B. casual
C. careful
D. critical
细菌按其外形，主要有哪三大类？（）
A.葡萄球菌、链球菌和杆菌
B.球菌、杆菌、螺形菌
C.球菌、杆菌、弧菌
D.球菌、杆菌、芽胞菌
E.以上都不对
