11. In jazz music, a riff is a simple melodic figure, _________ and repeated several times.
(A) usually one or two measures lasted
(B) lasted one measure or two usually
(C) is lasting one or two measures usually
(D) usually lasting one or two measures
and 是平行结构,好像选B,但答案却是D,不知道是什么原因?
12. At its center, the sun has a density of over a hundred times _________ and a temperature of 10 to 20 million degrees centigrade.
(A) that of water
(B) of water
(C) than that of water
(D) water
对这种比较结构的用法不清楚,劳烦牛人给讲解一下吧
23. The water of the Atlantic, Pacific, and Indian Oceans make up 70.8 percent to the Earth’s surface.
water作水域讲,可是没有用复数,为什么C里面的make up不用单数形式呢?
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