According to scientists, our mental abilities begin to____ from the age of 27 after reaching the highest level at 22.
#13700
A
differ
B
shrink
C
fail
D
decline
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Population experts say that by 2050 the world will have about 2 billion people aged over 60,____as today.
#14137
A
as three times
B
three times as many
C
three times many
D
three times many as
 If it was not an accident, he must have done it ___________.
#13121
A
on purpose
B
for purpose
C
in time
D
with care