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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【判断题】马克看到妈妈的邮件，也听到了妈妈的声音。mǎ kè kàn dào mā ma de yóu jiàn ,yě tīng dào le mā ma de shēng yīn.（ ）
A.
正确
B.
错误
【单选题】毒性的上限指标有
A.
绝对致死量，最大耐受量，最大无作用计量，最小致死量
B.
绝对致死量，最大耐受量，半数致死量，最小致死量
C.
绝对致死量，最大无作用计量，阈计量，半数耐受计量
D.
绝对致死量，阈计量，最大耐受量，最小致死量
【单选题】In the last two hundred years there have been great changes in the method of production of goods. This is now also true of the building industry; for mechanization has been introduced. System building...
A.
the latter uses ready-made internal features
B.
panels are cast in a level position
C.
the former is used to build walls and floors while the latter to construct bathrooms or bedrooms
D.
the former is more expensive than the latter