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13.
15.
The exercise ball used by physical fitness trainers are
A
very effective in activating the electromyographic
B
activity of the abdominal muscles, thereby making
C
core training during exercise more efficient. No error
D EBecause the wind was unusually strong, Caroline
A
finished ten seconds behind her opponent in the relay
B
race, even though she had ran steadily all the way
C
from the starting line. No error
D ETo demand that others do whatever one wants them to
A B
do is often ignoring the wishes and even the needs of
C D
those who care the most. No error
E