单选题：It is important us the balance of nature.

题目内容：

It is important us the balance of nature. A．for…to keep
B．of…to keep
C．for…keeping
D．of…to have kept

参考答案：

答案解析：

His father died and him a lot of money.

His father died and him a lot of money. A．sent B．afforded C．left D．gave

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The best title for the passage would be _______. A．New Uses For Computers B．The

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