1. Archaeological and geological excavations indicate which a primitive type of corn was used as food in North America at least 7000 years ago.
𰸣B
c(din)B~`eZľBthatwhich
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2. The major component of the sedimentary rock called shale is clay an earthy fine-grained material consisting primary of a particular group of crystalline minerals.
𰸣C
c(din)~ø~Consist of ̶primaryconsist(yng)ijprimarily
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3. Copper was the first metal used by humans and is second only to iron into its utility through the ages.
𰸣C
c(din)~`áijin its utility
gģ~ʹõĽҲǺܶʹԃHFĽ
4. The mineral chalcopyrite usually is found in compact masses or in mixtures with various other mineral as opaque brass-yellow tetragonal crystals.
𰸣C
c(din)~Δ(sh)`ijminerals
gģS~VͨԲS~ɫĽνY(ji)ķʽھo|(zh)NV|(zh)wбl(f)F(xin)
5. Because the study of chemistry encompasses the entire material universe it is central to the understand of other sciences.
𰸣D
c(din)~`áUnderstandԭDŽ~@(yng)ԓ~ʽunderstanding.
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