大全677 sunspots

thornbirdcfa · 发表于 2004-1-8 09:05:00

4. Sunspots, vortices of gas associated with strong electromagnetic activity, are visible as dark spots on the surface of the Sun but have never been sighted on the Sun’s poles or equator.
(A) are visible as dark spots on the surface of the Sun but have never been sighted on

(C) appear on the surface of the Sun as dark spots although never sighted at

为什么A错呢？be visible to sb as 是正确的短语啊！C的意思好像没有A通顺呢？
谢谢～～～～～～～～～～～～～

shellyaaa · 发表于 2004-1-8 11:04:00

留心最后的介词。

thornbirdcfa · 发表于 2004-1-8 12:05:00

为什么不可以用on 要用at呢？　：（

JerryGuan · 发表于 2004-3-18 15:51:00

poles 是一点概念所以用at

xjlv128 · 发表于 2006-6-10 09:24:00

用google搜，on,at the poles都有。估计这里强调“点“的概念

agnesliu · 发表于 2010-7-25 10:10:47

同OG12-14
给的正确答案是A。所以你对的，大全答案错

大全677 sunspots

大全677 sunspots

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