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【单选题】
企业某新产品开发成功的概率为80%，成功后的投资报酬率为40%，开发失败的概率为20%，失败后的投资报酬率为-100%，则该产品开发方案的预期投资报酬率为（ ）。A.
18%
B.
20%
C.
12%
D.
40%
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举一反三
【单选题】I tried to persuade him to give up the foolish idea, but in ________, and now he begins to regret.
A.
vain
B.
turn
C.
return
D.
case
【单选题】I tried to persuade him, but with little or no .
A.
consequence
B.
result
C.
outcome
D.
effect
【简答题】I tried to persuade her to ________ her job as secretary.
【单选题】I tried to persuade him not to smoke,but he________listen. [ ]
A.
wouldn't
B.
couldn't
C.
shouldn't
D.
mustn'
【单选题】I tried to persuade my husband to give up smoking but ________. [ ]
A.
in advance
B.
in vain
C.
in charge
D.
in order
【单选题】5个月婴儿，夜间烦躁不安，多汗，枕秃，有颅骨软化。血钙2mmol／L、血磷1．0mmol／L、碱性磷酸酶310U／L（金氏单位）。诊断及治疗应为下列哪组（）
A.
佝偻病初期，维生素D治疗
B.
佝偻病活动期，维生素D治疗
C.
佝偻病恢复期，维生素D治疗
D.
佝偻病恢复期，维生素D预防
E.
佝偻病后遗症期，不需治疗
【单选题】I tried to persuade him to work hard, but with little ________.
A.
effect
B.
effective
C.
effectively
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