【简答题】Which word(s) in the passage can best replace the phrase 'natural selection'?
【单选题】It can be concluded from the passage that the author's attitude toward 'sex selection' is ______.
【判断题】《黄帝内经》认为音乐治疗评估时要评估病人的生活环境,生活环境主要指饮食习惯与居住环境。
【判断题】《黄帝内经》认为音乐治疗评估时要评估病人的社会属性,社会属性主要指社会地位(政治地位与经济状况)以及它们的变化情况。
【单选题】The selection of spare spring in suction valve and delivery valve of first stage must bevery careful because_____.
A.
the spring assembly design is very critical to ensure correct valve action
B.
it is usual for the suction valve to have a lower spring pressure than the delivery valve
C.
the valve operates once every revolution and the valve movements are extremely frequent
D.
if the compressor is overheating wear and fatigue will occur
【单选题】适合亮度差异比较平均的环境的测光模式为()
【简答题】If natural selection was to account ______ the evolution of man's higher faculties, as Darwin was convinced it could, then those faculties must have a material basis.