One theory, ________ suggested by Harvard University, is that humans began cooking their food, thereby releasing nutrients locked in the raw food and reducing the time needed to chew it.
#67116
A
which
B
as
C
that
D
what
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The reason ______ most Chinese have healthy white teeth is ______ they eat a healthy diet.
#69649
A
why; that
B
why; because
C
that; that
D
for; that
Young people nowadays are different ______ we used to be．
#72911
A
from what
B
in which
C
in how
D
in what
You can find whatever you need at the shopping centre,_____is always busy at the weekend.
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A
that
B
where
C
what
D
which
____is known to us all,,things can easily go wrong when people are under______.
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A
Which;control
B
As; load
C
It; strength
D
As; stress
_____ is known to all, the age _______ children can go to school is seven.
#70754
A
What; which
B
It; when
C
As; at which
D
Which; when