单项选择题

What is implied by saying "a layer of soil acts as a sponge" (Para. 2)

A．Soil can be used to clean things.
B．Soil can store water and give it up when needed.
C．Soil is all elastic material.
D．Soil can provide water.
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单项选择题
She decided to ______ in the history course at the local evening school.
A．assign
B．admit
C．involve
D．enroll
单项选择题
Ms. Green has been living in town for only one year, yet she seems to be ______ with everyone who comes to the store.
A．acquainted
B．informed
C．accustomed
D．accepted
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