题目内容

【题目】荒漠化已成为当今全球最为严重的生态环境问题之一。根据联合国环境署推断，目前世界约1／4的陆地、2／3的国家和地区受到荒漠化的威胁。中国是全球荒漠化面积大、分布广、危害严重的国家之一，其中西北地区则是我国风沙危害和荒漠化问题最为突出的地区。回答下列问题。

【1】下列自然特征中，本身就包含着荒漠化潜在威胁的是

A.干旱的气候条件

B.高原、盆地为主的地形

C.人口激增

D.过度放牧

【2】在荒漠化的发生、发展过程中，常常起决定性作用的是

A.草原、荒漠为主的植被 B.人类活动

C.疏松的沙质沉积物 D.气候变异

【答案】

【1】A

【2】B

【解析】

试题分析：

【1】西北地区气候干旱，降水少，因干旱植被覆盖率低，风沙危害大，易产生荒漠化，所以干旱的气候条件本身就有荒漠化的威胁，而CD项为人为因素不是自然特征，故选A。

【2】荒漠化产生有自然原因也有人为原因，而人为原因对荒漠化起决定作用，故选B。

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How To Write A Proper “Thank You” Email

In our daily life, it’s important that you know how to write a proper, and professional thank you email.

Use the correct name.

Whoever the person you are writing the email to is, you want to make sure you thank them by showing them your paying enough attention to know their name. While the difference between Dr. and Mr. or Joe and Joan, may be a couple letters, they’ll notice. 【1】

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Always use the subject line.

Never accept that little message that turns up when you try to send an email without a subject line. 【3】 An email without a subject line is either going to get overlooked or deleted.

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An email with spelling or grammar mistakes shows that you didn’t care about the email enough to give it the time to be corrected.

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