The _______ of new inventions (发明) should be to make life easier, not to make it harder.

题型：单选题题类：常考题难易度：容易

江苏省扬州市江都区2015-2016学年八年级下学期期末测试

A、secrets B、rules C、subjects D、Purposes

举一反三

— That's right. So my main now is improving my English.

— It is October 19.

—He is a teacher. He has much ______ to do.

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