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【简答题】
下图是高等动物体内细胞与外界进行物质交换图。 从图中可以看出，维持内环境渗透压的Na + 和Cl - 以及葡萄糖、氨基酸等物质进入内环境要经过（）、（）系统。
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举一反三
【单选题】Heavy smokers risk _____ their health greatly.
A.
to damage
B.
damaging
C.
damaged
D.
damage
【单选题】Who are most likely to be overweight according to Katherine Flegal's study?
A.
Heavy smokers.
B.
Passive smokers.
C.
Those who never smoked.
D.
Those who quit smoking.
【简答题】理论回答并解决了哪些基本问题
【简答题】理论回答并解决了哪些基本问题？
【单选题】Though many of the heavy smokers have realized the serious effect that smoking has ______ their health, they continue to smoke instead of ______.
A.
for; giving it up
B.
on; quitting
C.
to; abandoning
D.
on; leaving
【单选题】Though the “No smoking” signs have existed for long in public places, heavy smokers often ________ them and light up cigarettes.
A.
abandon
B.
postpone
C.
decline
D.
ignore
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