题目内容
（请给出正确答案）
Fresh air is ______ to good health. So you should go out more and take more fresh air.
A．fundamental
B．elementary
C．principal
D．dominant
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更多“Fresh air is ______ to good he…”相关的问题
if headaches only occur at night, lack of fresh air is often the cause.
A．deliver
B．fall
C．happen
D．arrive
A．Because the air is fresh then.
B．Because our memory is efficient then.
C．Because we can plan for our day.
D．Because we can run to school for exercise.
If headaches only occur at night, lack of fresh air is, often the cause.
A．start
B．begin
C．happen
D．visit
Roots have the ability to ______.
A．make proteins
B．obtain fresh air
C．produce inorganic nitrogen
D．carry out activities without energy
–___________
A.Come on
B.Take care
C.Go ahead!
If headaches only occur at night, lack of fresh air is often the cause.（）
A．start
B．begin
C．happen
D．visit
