急性有机磷农药中毒，中度中毒是（）。
A.血胆碱酯酶活力<10%
B.血胆碱酯酶活力<20%
C.血胆碱酯酶活力<30%
D.血胆碱酯酶活力>50%
E.m胆碱酯酶活力30%～50%
参考答案：E
解析：急性有机磷农药中毒，轻度中毒血胆碱酯酶活力>50%；急性有机磷农药中毒，中度中毒血胆碱酯酶活力30%～50%；急性有机磷农药中毒，重度中毒血胆碱酯酶活力<30%。
| 完形填空。 | |||
| A rich father wanted to show his son how poor people can be. One day, he took his young son __1__ a trip to the country. They __2__ a day and night in the farm of a very __3__ family. When they got back from their trip the father asked his son, "how was the __4__ ?" "Very good, Dad!" "Did you see how poor people can be?" the father asked. "Yeah!" "And what did you __5__ ?" The son answered, "I saw that we have a dog at home, but they have four. We have a pool that reaches to the middle of the garden. They have a small river that has no __6__ . We have expensive lamps in the garden, but they have the __7__ . Our…" When the little boy was finishing, his father was __8__ . His son added, "Thanks, dad, for showing me __9__ poor we are!" Isn't it true that it all depends on the way you look at things? If you have love, friends, family, health, good humor and a positive attitude (积极的态度) toward life, you've got __10__ ! | |||
| ( ) 1. A. on ( ) 2. A. took ( ) 3. A. rich ( ) 4. A. trip ( ) 5. A. say ( ) 6. A. top ( ) 7. A. suns ( ) 8. A. wordless ( ) 9. A. what ( ) 10. A. nothing | B. in B. paid B. poor B. idea B. learn B. bottom B. stars B. happy B. how B. something | C. at C. spent C. good C. way C. remember C. end C. tents C. excited C. why C. anything | D. to D. cost D. happy D. life D. write D. cover D. cages D. pleased D. when D. everything |