题目内容

利用花草可以缓解室内装潢污染。()

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饮用水在水箱或水管内不可能受二次污染。()

谈谈防治消化道传染病应注意哪些问题？

If you _____your work, you can go there first.
A：will finish
B：finished
C：finishing
D：have finished

The length of chain between the anchor and the end of the pendant line is called the ______．

A. Pigtail chain
B. Thrash chain
Crown chain
D. Wear chain