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【单选题】
20110121下列关于预防和清除计算机病毒的叙述中,正确的是 (21) 。A.
专门的杀毒软件不总是有效的
B.
删除所有带毒文件就能清除所有病毒
C.
若U盘感染病毒，则删除其中的全部文件是杀毒的有效方法之一
D.
要使计算机始终不感染病毒，最好的方法是装上防病毒卡
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【单选题】男，65岁，有高血压及糖尿病史十余年，近数月来劳累后发生心前区闷痛，每次持续3分钟，含服硝酸甘油可迅速缓解，发作前后心电图有动态改变，对该患者冠心病有确诊意义的检查是
A.
运动平板试验
B.
超声心动图
C.
超声心动图
D.
胸部CT
【单选题】How does the driver figure out that the passenger is a first-time visitor to the city?
A.
The passenger catches a taxi for a short one-mile trip.
B.
The passenger does not understand the rules for tipping drivers.
C.
The driver finds the passenger lost on the street before picking him up.
D.
The driver notices the passenger gazing upward at the tall buildings.
【简答题】How much does the shop assistant offer to reduce at first? [A] Fifty dollars. [B] Five dollars. [C] Two hundred dollars. [D] Sy-five dollars.
【单选题】How does Alex feel about the first class?
A.
Still a little nervous after hearing what Amina says.
B.
Nervous throughout.
C.
Very nervous and a little embarrassed.
D.
A little nervous at first and relieved after hearing what Amina says.
【单选题】男,65岁,有高血压及糖尿病史十余年,近数月来劳累后心前区闷痛,每次持续1-3分,含服硝酸甘油可迅速缓解,发作期后心电图有动态改变,对该患者冠心病有确诊意义的检查是( )
A.
运动平板试验
B.
超声心动图
C.
胸片
D.
冠状动脉造影
E.
胸部CT
【单选题】How does the woman feel at first?
A.
Fairly relaxed.
B.
Quite confident.
C.
A bit worried.
【单选题】男，65岁，有高血压及糖尿病史十余年，近数月来劳累后发生心前区闷痛，每次持续1-3分钟，含服硝酸甘油可迅速缓解，发作前后心电图有动态改变，对该患者冠心病有确诊意义的检查是( )
A.
运动平板试验
B.
超声心动图
C.
胸片
D.
冠状动脉造影
E.
胸部CT
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