题目内容
（请给出正确答案）
What is the main concern of man on the fourth level？
A．The more foods the better.
B．The more mental satisfaction the better.
C．The more "luxury" items the better.
D．The more earnings the better.
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The cell walls of red and white blood cells are
semi-permeable mem-branes.The concentration of solute particles in the blood is about
0.60mol·L-1.What hap-pens to blood cells that are placed in pure water？
What happens when it in a1mol·L-1so-dium chloride solution？
The underlined sentence in Paragraph 2 means that ______.
A．the schools and parents are connected by the Internet so that teachers will leave school
B．parents can find out what happens with their children in school by visiting the Internet and so will the teachers
C．parents and educators may discover that schools are strange by using computers
D．the schools are online; parents now can teach their children and the teachers are to go
What didn't happen during the polls conducted by the Royal Society？
A．The Royal Society conducted the survey among both the scientists and the common people.
B．The surveys designed were based on the contribution the two scientists made to science.
C．The surveys designed were based on the contribution the two scientists made to mankind.
D．The Royal Society evaluated the contribution of the two scientists to science and mankind.
What is the main transport during the nine-day trip？
A．Plane.
B．Train.
C．Bus.
D．Boat.
A.introduction
B.body
C.chart
D.conclusion
