64. Going inside the earth is _____ than going into space. A. more interesting B. more possible C. easier D. more challenging 65. How deep have we gone into the earth until now? A. 6 miles. B. 4,000 miles. C. 7.5 miles. D. 25 miles. 66. 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. 67. 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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