ⅰ.语法填空，单句训练 1．there has been an increase in the technical cooperation and cultural ________ between china and other countries in the past ten years. 答案：exchange exchange意为“交换；交流”。符合句意。 2．the soldiers have to stand for hours without changing ________. 答案：position position意为“位置；姿势”。句意：士兵们不得不站几个小时不改变
