Lesson 42 Heinle

The Douglas fir is the source chief of lumber in the state of Oregon.

• Correct

• Incorrect

The painted turtle is a colored brightly, smooth-shelled turtle.

• Correct

• Incorrect

Trained in Europe, John Sargent became an extremely successful portrait painter in the UnitedStates.

• Correct

• Incorrect

Insects lived on the Earth before long the first mammal appeared.

• Correct

• Incorrect

The freezing point is the temperature which at a liquid becomes a solid.

• Correct

• Incorrect

Ammonia, a compound of nitrogen and hydrogen, has many industrial uses.

• Correct

• Incorrect

The Atlantic coastline of the United States is about 400 longer miles than the Gulf coastline.

• Correct

• Incorrect

Zoos provide an opportunity to study a wide range of animals, often in their habitats natural.

• Correct

• Incorrect

A test pilot tries out new kinds of aircraft to determine if are they safe.

• Correct

• Incorrect

The air of the upper atmosphere is just enough dense to ignite meteors by friction.

• Correct

• Incorrect