问题 单项选择题

蓄积器官是毒物在体内的蓄积部位,毒物在蓄积器官内的浓度高于其他器官,但对蓄积器官不一定显示毒作用。这种毒作用也可以通过某种病理生理机制,由另一个器官表现出来,这种器官叫作效应器官。根据上述定义,下列判断正确的是:( )

A.大气污染物中的铅经肺吸收后可转移并积存于人的骨骼中,损害骨骼造血系统,所以铅的蓄积器官是肺

B.大气污染物中的二氧化硫经人体的上呼吸道和气管吸入人体,并直接刺激上呼吸道和气管,所以上呼吸道和气管是蓄积器官

C.有机磷酸酯农药作用于神经系统,会造成神经突触处乙酰胆碱蓄积,使人产生流涎、瞳孔缩小等症状,所以神经系统是有机磷酸酯的效应器官

D.沉积于网状内皮系统的放射性核素对肝、脾损伤较重,引起中毒性肝炎,所以网状内皮系统是蓄积器官

答案

参考答案:D

解析:【解析】D。关键词是“在体内的蓄积部位”、“病理生理机制”。A项的蓄积器官是骨骼,B项中上呼吸道和气管没有起到蓄积作用,C项中神经系统不是效应器官,没有出现病理生理机制。

选择题
单项选择题

"Intelligence" at best is an assumptive construct--the meaning of the word has never been clear. It is generally agreed that a person of high intelligence is one who can grasp ideas (1) , make distinctions, reason logically, and (2) verbal and mathematical symbols in solving problems. An intelligence test is a rough measure of a child’s (3) for learning, particularly for learning the kinds of things required in school. It does not (4) character, social adjustment, physical endurance, manual skills, or artistic abilities. It is not (5) to--it was not designed for such (6) . To criticize it for such failure is roughly (7) criticizing a thermometer for not measuring wind velocity.

The other thing we have to notice is that the assessment of the intelligence of the (8) is essentially a comparative affair.

(9) the assessment of intelligence is a comparative matter we must be sure that the (10) with which we are comparing our subjects provides a "valid" and " (11) " comparison. It is here (12) some of the difficulties which interest us begin. Any test (13) involves at least three factors: the (14) to do one’s best, the knowledge required for understanding what you have to do, and the (15) ability to do it. In school populations in our culture these assumptions can be made fair and reasonable, and the value of intelligence testing has been (16) thoroughly. Its value (17) , of course, in its providing a satisfactory basis for prediction. No one is (18) interested in the marks a little child gets on his test; what we are interested in is whether we can (19) from his mark on the test that the child will do better or worse than other children of his age in (20) which we think require "general intelligence".

Read the following text. Choose the best word(s) for each numbered blank and mark [A] , [B] , [C] or [D] on ANSWER SHEET I.20()

A.respects

B.honors

C.angles

D.distinctions