In the late 1970s, the accepted medical theory was that ulcers were caused by stress, smoking, and alcohol,
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Chinese scientists will win the Nobel Prize soon.
A. Y
B. N
C. NG
By saying "more challenging" in the last paragraph the author means that undersea exploration is ______
A. more interesting
B. more attractive
C. more demanding
D. more dangerous
Which of the following describes the author's probable attitude toward Sir Christopher Wren's plans？
A. He feels it would have been a mistake to rebuild London according to Wren's designs.
B. He feels it was a mistake for London not to have been rebuilt according to Wren's designs.
C. He feels that someone other than Wren should have been chosen to plan the rebuilding.
D. He feels that Wren's ideas had much more influence than is commonly acknowledged.
Which of the following is NOT mentioned in the passage？
A. New techniques are continually developed and new machines invented for undersea exploration
B. If not well built, a submersible is likely to get crushed in deep water.
C. A submersible, when manned, looks very much like a spaceship.
D. In certain respects, undersea exploration is often faced with the same problem as space travel is.
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