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举一反三
【单选题】Questions 47 to 56 are based on the following passage. Some people’s ears produce wax like busy little bees. This can be a problem even though earwax (耳垢) appears to (47) an important purpose. Experts...
A.
stickyI) blockage
B.
hardJ) made
C.
expelled K) infections
D.
protects L) partly
E.
listening M) serve
F.
clean N) traps
G.
heating O) slight
H.
safe