What are passive alcohol sensors? • A. Devices that can detect alcohol in the air, without asking the driver to do anything.
O B. Devices that can detect alcohol in the air, with the help of the driver.
C. Devices that can detect alcohol in the blood, without asking the driver to do anything.

What are the two main ideas of this passage? museum experts feel that museums must change to attract visitors. museum experts care more about the number of visitors than about history. museums that display artworks and exhibits do not make families welcome. museums like colonial williamsburg make learning about the past fun. museums in the united states are different than in other countries.