Perez thinks the brain chemical may be a marker for genetic vulnerability (脆弱性) to anxiety and depression. But it can also respond to changes in the environment in a positive way, possibly by preserving new brain cells.
While both the calm and anxious rats produced the same number of new brain cells, these cells were less likely to survive in the high-anxiety rats, the team found. Giving the rats better living conditions or injecting them with FGF2 helped improve cell survival.
“This discovery may pave the way for new, more specific treatments for anxiety that will not be based on sedation(药物镇静), but will instead fight the real cause of the disease,” Dr. Pier Vincenzo Piazza from France said in a statement.
66. From the passage we can infer that with the levels of FGF2 decreasing, the rats will______ .
A. die of anxiety soonB. suffer from a headache
C. become more anxious D. become more relaxed
67. What’s the better way to increase the levels of FGF2?
A. Introducing more companions to the anxious rats.B. Improving the living conditions of the anxious rats.
C. Injecting the anxious rats with some special medicine.
D. Giving the anxious rats more time to relax.
68. The underlined word “it” in Paragraph 4 refers to .
A. the brain
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