Water and air are _______ to human beings. We can not live without them. (B2-U1)
A: harbou
B: function
C: definite
D: essential
A: harbou
B: function
C: definite
D: essential
举一反三
- Air pollution is becoming worse. As is known to all, air to us is ________ water to fish. No one can imagine how human being can live without air.
- Only when human beings live ____harmony with nature can we lead a better life. A: at B: on C: in D: with
- We can live without clothes, but food and drink are ________to life. A: essential B: force C: appropriate D: emergency
- We can live without clothes, but food and drink are______to life. A: vacant B: essential C: essay D: impossible
- Without air protection, the sun's rays______. A: will become very cold B: will do good to human beings C: will become hot D: will do harm to human beings