11 In jazz music,a riff is a simpe melodic figure,( D )and repeated several times.
A usually one or two measures lasted
B lasted one masture or two
C is lasting one or two measures usually
D usually lasting one or two measures
and 连接的应该是并列句,动词的形式应该一致,可是在此题中前面是ing而后面是ed形式的?
12 At its center,the sun has a density of over a hundred times (A)and a temperature of 10 to 20 miliion degrees centigrade.
A that of water
B of water
C than that of water
D water
我选的答案是C 觉得应该要加than