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【简答题】

Where do pesticides (杀虫剂) fit into the picture of environmental disease We have seen that they now (36) soil, water, and food, that they have the power to make our streams fishless and our gardens and woodlands (37) and birdless. Man, however much he may like to pretend the contrary, is part of nature. Can he escape a pollution that is now so thoroughly (38) throughout our world
We know that even single (39) to these chemicals, if the amount is large enough, can cause extremely severe poisoning. But this is not the major problem. The sudden illness or death of farmers, farm workers and others exposed to (40) quantities of pesticides is very sad and should not occur. For the population as a whole, we must be more concerned with the delayed effects of absorbing small amounts of the pesticides that (41) pollute our world.
Responsible public health officials have pointed out that the biological effects of (42) are cumulative (累积的) over long periods of time, and that the er to the individual may depend on the sum of the exposures received throughout his lifetime. For these very reasons the er is easily (43) . It is human nature to shake off what may seem to us a (44) of future disaster. "Men are naturally most impressed by diseases which have obvious signs," says a wise physician, Dr Rene Dubos, "yet some of their worst enemies slowly approach them (45) ".
A.chemicals
B.obviously
C.threat
D.pollute
E.found
F.invisibly
G.touch
H.distributed
I.sufficient
J.avoided
K.exposure
L.ignored
M.silent
N.unnoticed
O.small

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【单选题】很多国家已停止使用含铊的杀虫剂。元素周期表中铊的数据见右图,下列说法正确的是

A.
TI元素是一种主族元素
B.
TI元素的相对原子质量是204
C.
铊元素的质量数是204.4
D.
TI原子最外层有3个能量相同的电子

【单选题】Many Americans harbor a grossly distorted and exaggerated view of most of the risks surrounding food.Fergus Clydesdale, head of the department of food science and nutrition at the University of Massac...

A.
They overlook the risks of the food they eat.
B.
They overestimate the hazards of their food.
C.
They are overoptimistic about the safety of their food.
D.
They overstate the government's interference with the food industry.

【多选题】累积增长量与逐期增长量( )。

A.
前者基期水平不变,后者基期水平总在变动
B.
二者存在关系式:逐期增长量之和二累积增长量
C.
相邻的两个逐期增长量之差等于相应的累积增长量
D.
根据这两个增长量都可以计算较长时期内的平均每期增长量
E.
这两个增长量都属于速度分析指标
相关题目:
【单选题】很多国家已停止使用含铊的杀虫剂。元素周期表中铊的数据见右图,下列说法正确的是
A.
TI元素是一种主族元素
B.
TI元素的相对原子质量是204
C.
铊元素的质量数是204.4
D.
TI原子最外层有3个能量相同的电子
【单选题】Many Americans harbor a grossly distorted and exaggerated view of most of the risks surrounding food.Fergus Clydesdale, head of the department of food science and nutrition at the University of Massac...
A.
They overlook the risks of the food they eat.
B.
They overestimate the hazards of their food.
C.
They are overoptimistic about the safety of their food.
D.
They overstate the government's interference with the food industry.
【多选题】累积增长量与逐期增长量( )。
A.
前者基期水平不变,后者基期水平总在变动
B.
二者存在关系式:逐期增长量之和二累积增长量
C.
相邻的两个逐期增长量之差等于相应的累积增长量
D.
根据这两个增长量都可以计算较长时期内的平均每期增长量
E.
这两个增长量都属于速度分析指标
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