Scientists learn about monarchs’ migration by catching and making marks on the insects. By reaching a monarch with such a mark and noticing where it came from, the next scientist can get to know things like the butterfly’s age and its routing.
15. One of the places where monarchs spend the winter is _________.
A. the Gulf of Mexico
B. an area in Mississippi
C. a forest in Mexico
D. a plain in Texas
16. Which of the following is not true?
A. Every year in the early summer monarchs begin their journey to the south.
B. Not every butterfly makes the round –trip journey every year.
C. Monarch butterflies are the only insect that migrates.
D. Monarch butterflies begin their long journey north in spring
17. The routing of monarchs’ migration can be learned ________.
A. by examining the marks made on them
B. by collecting their eggs in the mountains
C. by comparing their different ages
D. by counting the dead ones in the forest
18. What is the subject discussed in the passage?
A. Migration of monarchs
B. Scientists’ interest in monarchs.
C. Winter home of monarchs
D. Life and death of monarchs
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