题目内容
Being a detective, one must be very patient and careful when he/she is ______ work.
A.of B.at C.for D.by
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Marie wants to make three sandwiches for her family in the evening. But there is only enough cheese and 4 pieces of bread in her house. A sandwich needs two pieces of bread, 0.1 kilos of lettuce and 0.5 kilos of chicken. Then how much she should spend at least in the supermarket in order to make their dinner?
Bread | Lettuce | Chicken | Cheese |
$ 0.5/piece | $ 2/kilo | $ 4/kilo | $ 5/bag |
A.$ 7.6 B.$ 8.2 C.$ 3.2