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【单选题】
The military may ________ if the crisis continues.A.
step out
B.
step on
C.
step in
D.
step up
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举一反三
【单选题】The immune ( 免疫 ) system is our main _______ against disease.
A.
excuse
B.
offense
C.
defense
D.
apology
【单选题】The immune system (免疫系统) is the boby's defense infection(感染).
A.
for
B.
against
C.
by
D.
of
【单选题】The immune system(免疫系统) is the body’s defense _______ infection.
A.
for
B.
against
C.
by
D.
of
【单选题】The immune system(免疫系统)is the body's denfense __________ infection(感染).
A.
for
B.
against
C.
by
D.
of
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