Perseverance is a kind of quality---- and that's _____ it takes to do anythign well.
A. what
B. that
C. which
D. why
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The shopkeeper did not want to sell for ______ he thought was not enough.
A. where
B. how
C. what
D. which
The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
A. what
B. which
C. that
D. though
调查报告的结尾部分可以写什么内容?
A. 总结全文,深化主题
B. 提出问题,启发思考
C. 表示决心,展望未来
D. 指明方向,提出建议
调查报告是经历了调查、研究、( )三个环节才最终形成的书面材料。