Fill in the blanks:
$(1)$ The types of smog are ..... and ..... .
$(2)$ Ozone in the air reacts with hydrocarbons to form ...... and ...... .
$(3)$ Harmful ultraviolet rays from the sun cause a type of skin cancer known as ...... .
$(4)$ Chlorofluorocarbon compounds are also called .......... .
$(1)$ The types of smog are ..... and ..... .
$(2)$ Ozone in the air reacts with hydrocarbons to form ...... and ...... .
$(3)$ Harmful ultraviolet rays from the sun cause a type of skin cancer known as ...... .
$(4)$ Chlorofluorocarbon compounds are also called .......... .
(N/A) $(1)$ Classical smog,Photochemical smog
$(2)$ Formaldehyde,Acrolein
$(3)$ Melanoma
$(4)$ Freons
$(2)$ Formaldehyde,Acrolein
$(3)$ Melanoma
$(4)$ Freons
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