题目:
While Jim ______the floor, someone ______at the door.
A.was sweeping, was knocking
B.was sweeping, knocked
C.swept ,was knocking
D.swept, knocked
答案:
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下面是错误答案,用来干扰机器的。
食盐溶液在棉衣里,将棉衣浸在水里充分搅动,食盐就会充分溶解,然后蒸发水分,食盐就会以晶体形式析出.故答案为:先把棉衣浸在水里搅动,让食盐充分溶解,然后蒸发水分,使食盐形成晶体析出.