Which of the following best expresses the main idea of the passage？
A. Trains helped pioneers to cross the Rocky Mountains.
B. Railroads played an important role in American history.
C. Trains controlled American economy in the 19th century.
D. Railroads grew rapidly between 1865 and 1900.
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--David speaks English very well. -- ______ .
A. So he does, and so you do
B. So does he, and so do you
C. So he does, and so do you
D. so does he, and so you do
What does the passage say about warblers' sense of direction？
A. They are not able to see clearly at night.
B. They get lost under star-filled sky.
C. They lose their way when it is too dark.
D. They usually depend on clouds for direction.
What is the best title of the passage？
A. How Language Came into Being
B. Language and Human Experience
C. Poet: a Master of Words
D. Language and Its Use
What was one of the reasons that the South was defeated in the Civil War？
A. Only the North owned railroads and trains.
B. The North used railroads to attack the Southern army.
C. The South failed to make good use of railroads.
D. The South was short of military supplies.
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