保育员应具备心理素质与（）。
A.合作精神
B.爱心
C.专业素质
D.丰富的知识
参考答案：C
解析：现代社会对保育员提出了更高的要求。
You can’t guess ______ when he was admitted by Beijing University.
A．how he was happy
B．how happy was he
C．how happy he was
D．he was how happy
有买入金融资产权的期权叫做看涨期权，有卖出金融资产权利的期权叫做看跌期权。（）
