题目
[A] if
[B] when
[C] unless
[D] even if
第1题
We will not attack ______ we are attacked; if attacked, we will certainly counter-attack.
A.if
B.when
C.unless
D.even if
第2题
We will not attack ______ we are attacked; if attacked, we will certainly counter-attack.
A. if
B. when
C. unless
D. even if
第4题
I ______all that we had done and then went on to deal with the attack by the police.
A.justified
B.excused
C.convicted
D.notified
第5题
As we know from the 3rd paragraph, many people believe that ______.
A.the attack was led by Bin Laden
B.those who directed the attack was better engineers than those who built the towers
C.those who directed the attack know quite a lot about the towers
D.the attack was made spontaneously
第6题
We can learn from the fourth paragraph that
A.students are easily attacked by the Norwalk-like virus.
B.Norwalk-like viruses tend to break out in closed crowded place.
C.Norwalk-like viruses might cause flu.
D.Norwalk-like viruses are not widespread.
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