过滤作业主要是去掉物料中（）
A、毛细水
B、分子水
C、重力水
D、重力水和毛细水
参考答案：D
根据图片和句意完成句子。
1. Look! They are ________. ()
2. This is a ________. ()
3. Is that your baseball in the ________? ()
4. —Is this ________? ()
—Yes, it is. It's an English book.
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