If the statements above are true, which one of the following must also be true on the basis of them?
(A) If Mars had a sufficiently large nearby moon, Mars would be able to support life.
(B) If Earth's Moon were to leave Earth's orbit, Earth's climate would be unable to support life.
(C) Any planet with a stable, moderate axis tilt can support life.
(D) Gravitational influences other than moons have little or no effect on the magnitude of the tilt angle of either Earth's or Mars's axis.
(E) No planet that has more than one moon can support life
17. Psychologist: Some astrologers claim that our horoscopes completely determine our personalities, but this claim is false, I concede that identical twins——who are, of course, born at practically the same time——often do have similar personalities. However, birth records were examined to find two individuals who were born 40 years ago on the same day and at exactly the same time——one in a hospital in Toronto and one in a hospital in New York. Personalities of these two individuals are in fact different.
Which one of the following is an assumption on which the psychologist's argument depends?
(A) Astrologers have not subjected their claims to rigorous experimentation.
(B) The personality differences between the two individuals cannot be explained by the cultural difference between Toronto and New York.
(C) The geographical difference between Toronto and New York did not result in the two individuals having different horoscopes.
(D) Complete birth records for the past 40 years were kept at both hospitals.
(E) Identical twins have identical genetic structures and usually have similar home environments.
18. Modern navigation systems, which are found in most of today's commercial aircraft, are made with low-power circuitry, which is more susceptible to interference than the vacuum-tube circuitry found in older planes. During landing, navigation systems receive radio signals from the airport to guide the plane to the runway. Recently, one plane with low-power circuitry veered off course during landing, its dials dimming, when a passenger turned on a laptop computer. Clearly, modern aircraft navigation systems are being put at risk by the electronic devices that passengers carry on board, such as cassette players and laptop computers.
Which one of the following, if true, LEAST strengthens the argument above?
(A) After the laptop computer was turned off, the plane regained course and its navigation instruments and dials returned to normal.
(B) When in use all electronic devices emit electromagnetic radiation, which is known to interfere with circuitry.
(C) No pro
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