单项选择题

He()a lot of time in trying to develop the education system in this are

A、involved
B、investigated
C、invested
D、interfered

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单项选择题

Based on the information in Tables 1 and 2, the heat released from the burning of 5.0 g of potato in a bombcalorimeter would be closest to which of the follow-ing?

A.0
B.5
C.10
D.15
E.20

单项选择题

Which of the following lists the foods from Tables 1 and 2 in increasing order of the amount of heatreleased per gram of food?

A.Potato,
B.Sucrose,
C.Bread,
D.Sucrose,