ACCorDing to thE First pArAgrAph, thE AtmosphErE is EssEntiAl to mAn in thAt ______.
A．it protECts him AgAinst thE hArmFul rAys From spACE
B．it proviDEs suFFiCiEnt light For plAnt growth
C．it suppliEs thE hEAt nECEssAry For humAn survivAl
D．it sCrEEns oFF thE FAlling mEtEors