Navigators have known for thousands of years that the ocean has variable currents, but it is only in the last half century that a reasonably clear picture has emerged of the patterns and causes of ocean currents.
Answer: A
of the patterns and causes of ocean currents为什么放在emerge后面呀？
Navigators have known for thousands of years that the ocean has variable currents, but it is only in the last half century that a reasonably clear picture has emerged of the patterns and causes of ocean currents.
B.(a reasonably clear picture of the patterns of ocean currents) and (their causes) have emerged 用have改变原文的意思，变成了picture和causes的并列。即便改成has，their的指代仍然错。A表达清晰不含歧义。
我明白了，A中把has emerged 提前是为了避免歧异
这里是patterns 和causes并列
如果写成a reasonably clear pictureof the patterns and causes of ocean currents has emerged
会让人误会成 picture of the patterns 和causes of ocean currents 一起emerge
我明白了，A中把has emerged 提前是为了避免歧异
这里是patterns 和causes并列
如果写成a reasonably clear pictureof the patterns and causes of ocean currents has emerged
会让人误会成 picture of the patterns 和causes of ocean currents 一起emerge
New pictures have emerged of the Nokia 870 internet tablet which is an upgrade of the Nokia 770.
看来：emerge of 是习惯用法
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