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unit 1 keeping healthy
text a drugs
text b defending against infection
unit 2 family affection
text a my mom¡¯s sacrifice for me
text b making friends in family
unit 3 psychological probe
text a fear of flying
text b the interaction of body and mind
unit 4 to be a leader
text a do you really want to be a leader?
text b how to be a leader
unit 5 looking into future
text a strolls can help teen smokers to quit
text b our future in space
unit 6 observation
text a the real key to a healthy life
text b the laws of nature
unit 7 saving our resources
text a egypt uses water resources to make deserts bloom
text b paper¡ªmore than meeting the eye
unit 8 journey of life
text a reasons you¡¯re stuck where you are
text b hate your job? here¡¯s how to reshape it
unit 9 environment protection
text a it¡¯s the end of the world...
text b the earth
unit 10 view of success
text a natalie portman
text b how to visualize your success
reference answers