Unit 4 Lesson 19 A Story or a Poem? 同步练习 （含解析）

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Unit 4 Lesson 19
一、单项选择
1．We must take action to cut down the use of plastic bags right now ________ it is too late.
A．before B．although C．if
2．To relax ourselves means to rest _______ we are doing something fun.
A．while B．if C．until D．although
3．Sharing a problem is like cutting it in half, _______...