单项选择题

Softwood comes from cone-bearing trees, which is （） conifers(针叶树).

A．planted
B．called
C．watered
D．laid

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单项选择题

We have studied long and hard to （） those objections.

A．overpay
B．overcome
C．win
D．omit

单项选择题

The book closes with a long and reasoned （） for the wrong doings.

A．report
B．story
C．apology
D．preface

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