题目内容

A communicable disease is one that can be transmitted from one perso to another . if many people in a given region acquire a certain disease at the same time, that disease is said to be . For example, the influenza, occur periodically today. If a given disease is found to a lesser extent but continuously in a particular region, the disease is to that area, the common cold is __in human populations. A disease that is prevalent throughout an entire country or continent or the whole world, is said to be pandemic. AIDS is now considered to be pandemic in certain areas of the globle.

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_____diseases, these diseases are relatively severe but usually last a short time._diseases, these diseases are often less severe but are likely to be continuous or recurring for long periods._diseases, these diseases are intermediate between the above two types of diseases, not being as severe as _ infections nor as long-lasting as_______ disorders.

A characteristic group of symptoms and signs that accompanies a disease is called a ___. Some complex disorders even have “” in their names. Such as Down _, acquired immunodeficiency _______(AIDS).

An inadequate diet may result in ______, on the contrary, and an adequate diet may result in_, both of the two ailment could be____ (outcome is dead).

一个基元反应,正反应的活化能是逆反应活化能的2倍,反应时吸热 120 kJ·mol-1,则正反应的活化能是( )

A. 120 ;
B. 240 ;
C. 360 ;
D. 60 。