皮皮学，免费搜题
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【单选题】
What is the proper attitude towards the researching on the Internet?A.
Use freely all the information you get online.
B.
Check the extensions of the address of the website to determine if it is reliable.
C.
You don’t have to attribute the information you get on the Internet to its source.
D.
none of the above
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】接触某种化学物后体内不一定能检出该物质,但由该物质引起的功能损害逐步累积起来,表现出中毒的病理征象,这种现象称为
A.
慢性中毒
B.
物质蓄积
C.
功能蓄积
D.
生物浓集
E.
生物转化
【简答题】Before going to the cashier, the writer knew nothing about the price of the mouse.
【单选题】在可变分区存储管理中,某作业完成后要回收其主存空间,该空间可能要与相邻空闲区合并。在修改空闲区表时,使空闲区个数不变且空闲区始址不变的情况是 _________ 。
A.
无上邻也无下邻空闲区
B.
无上邻但有下邻空闲区
C.
有上邻也有下邻空闲区
D.
有上邻但无下邻空闲区
【单选题】Before people knew how to make and use metals, engineering constructions were __________ built of wood or stone.
A.
practically
B.
every now and then
C.
finally
D.
mostly
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