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B. sent for a doctor at once

C. didn’t pay the bill for the doctor

D. took him to a charity hospital 35. Which of the following is true according to the passage? A. Hetty Green died a poor old woman. B. Hetty Green preferred money to anything else. C. Hetty Green liked to earn a lot of money so as to live a good life. D. Hetty Green hated her son and refused to take him to a good hospital. Passage 2People once widely believed that intelligent life existed on Mars. The 19th-century discovery of what appeared to be geometric designs cut across the surface was taken as evidence. The lines were thought to have been a system of canals that had been built to irrigate the surface. It is now clear that “canals” — perhaps the most spectacular geologic features of Mars — are natural valleys where ancient rivers once flowed. Another fragmented idea concerns the planet’s seasonal changes in color. Once attributed to the rapid spread of some life-form, these shifts are now known to develop from the movement of fine dust in the atmosphere. By the close of the 20th century none of the many experiments conducted by spacecraft had ever found persuasive evidence of life. Nevertheless, speculation continued over the existence of some form of life, in either the present or the past. In 1996 scientists discovered organic compounds and minerals in a meteorite （陨石）, consisting of Martian rock, that collided with Earth around 11,000 B.C. These compounds suggest that Mars may have been inhabited by organisms more than three billion years ago.

36. Why did people in the 19th century believe the existence of intelligent life on Mars?

A. Because the surface of Mars seemed to be geometric.

B. Because the lines were drawn across the surface of the planet.

C. Because a system of canals was thought to be there.

D. Because it was the Martians that built the canals.

37. The “canals” on Mars have proved to be ______ according to the passage.

A. the minor geologic characteristic of Mars

B. natural valleys on the surface of Mars

C. rivers that have kept flowing since ancient times

D. a system that irrigates the whole surface

38. What were the Mars’ seasonal changes in color believed to be?

A. The natural changes on the planet.

B. The seasonal cycles.

C. The movement of some life form.

D. The storm of dust in its atmosphere.

39. How is the 1996 discovery related to the possible existence of organisms on