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【单选题】
某种商品的再订购点为680件，安全库存量为200件，采购间隔日数为12天，假设每年有300个工作日，则年度消耗量是（）。A.
10000件
B.
110000件
C.
12000件
D.
13000件
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举一反三
【单选题】If you were my friend, you would have helped me.
A.
You are my friend.
B.
You were my friend.
C.
You are not my friend.
D.
You were not my friend.
【多选题】请指出下列哪些情况下,某食品的需求曲线将向右移动(需求减少)
A.
卫生组织发布一份报告，称该种食品含有致癌物
B.
另一种相似食品的价格上涨了
C.
消费者的收入增加了
D.
生产该食品的原料价格上涨了
【单选题】–Did you _____ your sister when you were in Shanghai? --No. But I _____ my uncle’s during my stay there.
A.
call on, called on
B.
call at, called at
C.
call on, called at
D.
call at, called on
【单选题】听力原文：W: What would you do if you were in my place? M: If Paul were my son，I'd just not worry. Now that his teacher is giving him extra help and he's working hard himself. he's sure to do well in the n...
A.
Teaching her son by herself.
B.
Having confidence in her son.
C.
Asking the teacher for extra help.
D.
Telling her son not to worry.
【单选题】能识别mRNA 中密码子5’-AGC-3’相对应的tRNA反密码子是
A.
3’-UGC-5’
B.
3’-UCG-5’
C.
3’-GCU-5’
D.
3’-GCT-5’
【简答题】许多人预测自然资源的价格相对于其他物品的价格应该保持持续上涨，因为随着世界人口的增长，对自然资源的需求在持续增加，其需求曲线不断向右上方移动，而自然资源是一种可耗竭资源，随着资源的日益枯竭其供给曲线将不断向左上方移动。然而，大多数自然资源的相对价格并没有上涨，相反，恰如美国经济学家朱利安·L·西蒙(Julian L. Simon)和生态学家保罗·R·埃利希(Paul R. Ehrlich)的“世纪...
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