1. Going inside the earth is　than going into space.

　　A. more interesting

　　B. more possible

　　C. easier

　　D. more challenging

　　2. How deep have we gone into the earth until now?

　　A. 6 miles.

　　B. 4, 000 miles.

　　C. 7. 5 miles.

　　D. 25 miles.

　　3. It can be inferred from the passage that　.

　　A. rocks get harder and harder but easily broken deep into the earth

　　B. rocks are hard and not easily broken at the surface of the earth

　　C. the analysis of earthquakes makes people know much about the inside of the earth

　　D. no efficient way has been found to explore the inside of the earth so far

　　4. Which of the following is TRUE about David Stevenson’s idea?

　　A. It is an inspiring but not practical idea now.

　　B. It is a practical proposal that has come into use now.

　　C. It is a good proposal that will soon be put into practice.

　　D. It is a false theory that cannot be carried out at all.

　　5. What might be the most suitable title for the text?

　　A. An Annoying Problem for Humans

　　B. To the Center of the Earth

　　C. The Mohole Project

　　D. David Stevenson’s Proposal

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