语法与词汇
22.Since its opening-up, China has experienced a______, with many of its brightest students remaining abroad after their university education.
【正确答案】
B
【答案解析】本题考查名词短语辨析。根据空后的内容“许多杰出的学生在大学毕业后仍留在国外”判断，这是人才外流现象，故brain drain(人才外流)符合语义，答案为[B]项。brain circulation意为“人才流动”；capital outflow意为“资本外流”；trade deficit意为“贸易逆差”。