根据网考网考试中心的统计分析，以下试题在2019/2/25日在职攻硕英语习题练习中，答错率较高，为：59%
【单选题】
The safety of ships at sea does not depend only on the arrangements made in the ships themselves.Dangerous coasts and rocks may be seen in the daytime, {{U}} (51) {{/U}}they are a threat to safe navigation at night. Lighthouses are therefore erected at such places to{{U}} (52) {{/U}}sailors of the danger. Modern lighthouses are put up at all dangerous places near the courses{{U}} (53) {{/U}}by ships. On some rocky coasts several lighthouses may be built not far from each other, and{{U}} (54) {{/U}}the sailors on a ship may know which is which, they have{{U}} (55) {{/U}}arrangements of lights. One lighthouse will give a single flash at regular{{U}} (56) {{/U}}, another may give two flashes; a third may give two followed by one; and so on. {{U}} (57) {{/U}}watching the lights the navigator is able to decide exactly where he is, and he can set his{{U}} (58) {{/U}}with confidence. In the approaches to some ports two continuous lights are set up, one above{{U}} (59) {{/U}}but some distance behind; when they appear from the sea one above the other, the ship is on the right course; but if they do not, the captain knows that he is{{U}} (60) {{/U}}his course and likely to strike a rock or the bottom of the seA、
A．however
B．and
C．but
D．or
网考网参考答案：C，答错率：59%
网考网试题解析：很显然，空格所在的句子上对于上句而言，意思发生转折，因此需要填入一个表示转折关系的连接词，正确答案为C。A项however是副词，不能用来连接两个并列的分句，故在本题中不能选用。B项and作连接词，表示同一意思的延续，D项or(或者)作连接词时表示选择。
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