问题
单项选择题 A1型题
某外源性化学物质的蓄积系数K>5时，表明该物质的蓄积毒性为（）
A.高度蓄积
B.明显蓄积
C.中等蓄积
D.轻度蓄积
E.不蓄积
答案
参考答案：D
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某外源性化学物质的蓄积系数K>5时，表明该物质的蓄积毒性为（）
A.高度蓄积
B.明显蓄积
C.中等蓄积
D.轻度蓄积
E.不蓄积
参考答案：D
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| When a friend was visiting David, it began 1 . So David told him 2 that night. "You may stay here 3 the night," he said. "OK," answered his friend. But 4 minutes 5 , the friend went out. He didn't tell David where 6 going nor (也没有) did he ask for an umbrella. When David was about 7 , his friend 8 . He was all wet through. "Where 9 you 9 ?" asked David. "I have been 10 ," answered the friend, "to tell my mother that I'll not go home tonight because of the rain." | ||||
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