单选题
We often hear the {{U}} {{U}} 1
{{/U}} {{/U}}"Bug" while using computers. But what is a bug? In computer
science, a bug {{U}} {{U}} 2 {{/U}} {{/U}}an error in software
or hardware. In software, a bug is an error in coding or logic that causes a
program to malfunction or to {{U}} {{U}} 3 {{/U}}
{{/U}}incorrect results. Minor bugs, for example a cursor that does not behave as
{{U}} {{U}} 4 {{/U}} {{/U}}can be inconvenient or frustrating,
but not damaging to {{U}} {{U}} 5 {{/U}} {{/U}}. More severe
bugs can cause a program to "hang" ( stop responding to {{U}} {{U}}
6 {{/U}} {{/U}}and might {{U}} {{U}} 7 {{/U}} {{/U}}the
user with no {{U}} {{U}} 8 {{/U}} {{/U}}but to restart file
program. ), losing whatever {{U}} {{U}} 9 {{/U}} {{/U}}work had
not been saved. In {{U}} {{U}} 10 {{/U}} {{/U}}case, the
programmer must find and correct the error by the {{U}} {{U}} 11
{{/U}} {{/U}}known as debugging. Because of the {{U}} {{U}} 12
{{/U}} {{/U}}risk to important data, commercial application programs are
tested and {{U}} {{U}} 13 {{/U}} {{/U}}as completely as possible
before release. Minor bugs found after the program becomes {{U}} {{U}}
14 {{/U}} {{/U}}are corrected in next update; more {{U}} {{U}}
15 {{/U}} {{/U}}bugs can sometimes be fixed with special software,
called patches, that circumvents or otherwise {{U}} {{U}} 16
{{/U}} {{/U}}its effects. In hardware, a bug is a recurring {{U}}
{{U}} 17 {{/U}} {{/U}}problem that prevents a system or set of
{{U}} {{U}} 18 {{/U}} {{/U}}from working together properly. The
{{U}} {{U}} 19 {{/U}} {{/U}}of the term reputedly goes back to
the early days of computer at Harvard University was {{U}} {{U}}
20 {{/U}} {{/U}}a moth caught between the contacts of a relay in the
machine.
【答案解析】[解析] 本题考查省略句的用法。完整的句子应该是“as it is expected”，意思是“正如人们所预想的”，但通常情况下，it is 是可以省略的。
单选题
A. information
B. material
C. memory
D. news
【正确答案】
C
【答案解析】[解析] 本题考查对上下文的理解。这一句话和下面的一句话形成对比，这句话说的是小的病毒对计算机的影响，下面一句话说的是大的病毒对计算机的影响，两者进行对比的出发点应当是一致的，即： whatever work had not been saved，应填入的单词应当是对此的同义表达即：memory。因此选项[C]是正确答案。
【答案解析】[解析] 本题考查动词的基本用法。四个选项中，grant，retain，reward都是及物动词，直接接宾语，不需要宾语补足语。只有leave后面可以用形容词，介词短语做宾语补足语，表示“使…停留在某种状态”。比如：He went away，leaving the windows open．他走了，窗户开着。He went away，leaving his little brother in tears．小弟弟还在哭，他就离开了。
【答案解析】[解析] 本题考查近义词辨析。这句话的意思是：由于对于计算机重要数据的潜在威胁。promising“有前途的”；potential(that may or call come into existence)“可能的，潜在的”；prospective(hoped for，looked forward to)“有望的，可能的”；probable(likely to happen or prove to be true)“可能发生或证实的”。
【答案解析】[解析] 本题考查近义词辨析。这句话的意思是：一旦小的病毒进入 (计算机)，就会立即被更正。affable“和蔼的，友善的”；adaptable“可适应的”，根据意思可以排除；available(able to be used or attained)“可获得的，可用的”，如：The book you want is available in the school bookstore．你要的书学校的书店里就有。accessible(able to be reached or visited)“可进入的，可参观的”，如：a town accessible by rail．有铁路通达的城镇。
【答案解析】[解析] 本题考查对文章意义的理解和同义词辨析。这句话的意思是：更严重的病毒可以使用特殊的软件来阻止或降低其影响。worsen“使严重，恶化”；enhance“提高，促进”；alleviate(make less or earner to bear)“减轻，缓和”，如：alleviate severe unemployment缓解严重的失业状况。reduces(make small in size，weight，etc)“减少”。
单选题
A. mental
B. physical
C. formal
D. substantial
【正确答案】
B
【答案解析】[解析] 本题考查形容词的基本意义。这句话的意思是：病毒是计算机自身反复发生的问题。mental“(人)精神的，大脑的”；physical (of the law of nature)①“自然律的”②“本身的，自身的”；(of the body)“本身的，自身的”；formal“正式的”；substantial“真实的，盛大的”。
单选题
A. compound B. compositionsC. components D. composure