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
(B) are visible as dark spots that never have been sighted on the surface of the Sun
(C) appear on the surface of the Sun as dark spots although never sighted at
(D) appear as dark spots on the surface of the Sun, although never having been sighted at
(E) appear as dark spots on the Sun’s surface, which have never been sighted on OG解释基本如下: 1.B选项,that从句扭曲了原意;由原来的并列成分变成从属成分;…on the surface of the Sun the Sun’s…?
being primarily a planter is not closely related to how they plant their crops (u r being reminded of this point as the original choice use the contrast word “but”)
alternatively,being primarily a planter is closely related to a sentence saying that they plant a wide range of crops
also,the existence of primarily gives u a great signal that the latter clause should not share the equal importance that the former has
you should read the sentence more carefully to really grasp the core meaning
The Iroquois were primarily planters, although they supplemented their cultivation of maize, squash, and beans with ?shing and hunting。 翻译过来:易洛魁人以种植者为主,虽然他们也通过打渔和打猎来补充其玉米、南瓜和豆的种植。