(2013·福建高考)The Forbidden City attracts a stream of visitors every day, especially during national holidays.
A. constant
B. main
C. powerful
D. shallow
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(答案→)A. constant
B. main
C. powerful
D. shallow
解析：选A 考查形容词辨析。句意：紫禁城每天都吸引着络绎不绝的游客，特别是在国庆节期间。a constant stream of visitors表示“络绎不绝的游客”。constant“持续不断的”，符合句意。main“主要的”；powerful“强有力的”；shallow“浅的”。