Page 17 - 新思维科学活动用书6 样章
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1 The human body
iii In the past, most girls started puberty at about the age of 14. Suggest a reason
why puberty starts at a younger age these days.
1.4 Diseases
Focus
1 Mark each one of these statements about diseases as true ( ) or false ( ).
a All infectious diseases are caused by viruses.
b A parasite lives on or in the body of another living thing.
c Living things that spread diseases always get the disease themselves.
d Diseases can be spread when we cough or sneeze.
e Washing hands with soap and water will stop germs spreading.
f Adding salt to water will make it safe to drink.
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