The number of speech pathologists(who help people who have problems speaking) double by the year 2012.
A. is expected to
B. are expected to
C. expects to
D. expect to
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(答案→)A. is expected to
B. are expected to
C. expects to
D. expect to
解析：考查词组和主谓一致：句意：据估计语言病理学家的数量到2012年将会翻翻。Be expected to do据估计…，排除CD，另外主语是the number of…的数量，谓语用单数，选A。