1.all eels spawn in the sea,the eggs haching into transparent, ribbonlike larva ______, feeding until they metamorphose into small eels.
a.that drift about b.drift about c.about drifting d.drift about them
答案是a,that是什么用阿?不明白,为什么不可以b
2.in western north America, _______ from the Great Divide which separates the areas from which waters flow either eastward to the Atlantic or westward to the Pacific.
a.the Rocky Mountains b.where the Rocky Mountains
C.the Rocky Mountains in which d.there are the Rocky Mountains
答案是a,为什么不能选d
3.although the huge ice masses ____ glaciers more slowly, they are a powerful erosive force in nature.
a.to call b.calling c.called
答案是c,为什么不选b ,过去分词后不加名词,不是吗? |