throat
B.thrust
C.trust
D.thread
29.If there is no other way to save a _______ person in a tall building on fire, fire fighters may spread a net into which the person can jump.
A.volt
B.wrapped
C.trapped
D.deserted
30.Since 1978, many new _______ have been developed in our university to meet the increasing demands of the students.
A.disciplines
B.entrances
C.checks
D.flames
答案:
21.C 22.D 23.C 24.D 25.C
26.C 27.A 28.B 29.C 30.A
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