[填空题]The risk of epidemics(流行病) may be slightly (high)（）in crowded urban areas than in rural areas.

[填空题]The risk of epidemics(流行病) may be slightly (high) ______ in crowded urban areas than in rural areas.

[单项选择]A risk or effect may diminish （　）, but it may also increase for some reason.
A. at will
B. over time
C. under way
D. so far

[单项选择]A risk or effect may diminish（）,but it may also increase for some reason.
A. at will          
B. over time
C. under way   
D. so far

[填空题]

For high-risk propositions yielding high returns, there is nothing to beat the handful companies marketing eternal life. (31) the perceived rewards of being able to come hack to life(32) some point, the risks are huge: Who would want to chance a repeat of disco or Victorian mores, let(33) more meaningless millennium hype in 2999
 There are(34) , more immediate risks involved in the new business of cryonics, {{U}}(35) is the deep freezing at death of human bodies for preservation and possible revival in future. The biggest problem is that,(36) now, it is impossible to freeze people and bring them back to life.
 On the other hand, if cryonics(37) , you were already dead anyway.
 (38) it comes from the same root, kryos, the Greek word for cold, cryonics is not to be(39) with the mainstream sciences of cryogenics or cryobiology. These involve freezing of metals or of simple organisms. Metals get stronger(40) deep freezing, while the freezing and