单项选择题

According to Figure 1, which of the following state-ments best describes how the resistivity of the sandand gravel layer compares to the resistivity of the tilllayers? The resistivity measured in the sand and gravellayer is:

A.lower
B.
B.higher
C.
C.the
D.
D.lower
E.

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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

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