问题补充：
Do you know how many colorsin the rainbow?
A. are there
B. there are
C. is there
D. there is
答案：
A. are there
(答案→)B. there are
C. is there
D. there is
解析：句意：你知道彩虹有多少种颜色吗？Know后面为宾语从句，应用陈述语序，所以选B。
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