A． She is a good cook.
B． She collects birds' nests.
C． She likes to have birds visit her garden.
D． She is a professional gardener.
A． They can determine the cost of construction.
B． They can reveal unsafe conditions for building.
C． They can show where landslides have occurred.
D． They can measure the rate of water drainage.
A． It often interferes with construction.
B． It helps keep the soil in place.
C． It grows quickly after heavy rains.
D． It makes slopes unstable.