D. will create new fields of study in universities
70. Who can make big money in the new century according to the passage?
A. Retirees who are business-minded.
B. The volunteer workers in retirement homes.
C. College graduates with an MBA or law degree.
D. Professionals with a good knowledge of gerontology
71. Why can businessmen make money in the elder market?
A. Retirees are more generous in spending money.
B. They can employ more gerontologists.
C. The elderly possess a large purchasing power.
D. There are more elderly people working than before..
E
ScienceDaily (July 5, 2009) — Researchers from the University of Haifa-Oranim have managed to make out the "self-irrigating" mechanism(构造) of the desert rhubarb(沙漠大黄), which enables it to harvest 16 times the amount of water collected by other plants in the Negev Desert. This is the first example of a self-irrigating plant worldwide.
The desert rhubarb grows in the mountains of Israel's Negev desert, where average rainfall is particularly low (75 mm per year). Unlike most of the other desert plant species, which have small leaves so as to reduce water loss, this plant is unique in that its leaves are particularly large; each plant's rosette (莲座型丛叶)of one to four leaves reaches a total diameter(直径) of up to one meter.
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