正确答案:

题目：生态农业的经济效益较低。( )

解析：×

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举一反三的答案和解析：

[单选题]期间为20年的诉讼时效，其开始计算的时间为( )。

权利受到侵害时

解析：D。考查对最长时效期间的掌握，A、B、C是普通诉讼时效的起算时间，D正确。

[单选题]下列哪种情况属于功能性蛋白尿( )

发热时

[单选题]If their marketing team succeeds, they __ their profits by 20 percent.

will increase

解析：【考情点拨】考查if引导的条件状语从句。 【应试指导】句意：如果他们的营销团队取得成功，那么他们的利润将增加20％。if引导的条件状语从句可以分为两类：真实条件句和虚拟条件句。当假设情况发生的可能性很大时，就是真实条件句；当假设不大可能实现时，就是虚拟条件句。根据句意，本句所表述的是客观情况，所以为真实条件句。从句中使用的时态为一般现在时，故主句应使用将来时，故选A。

[单选题]决定气体交换方向的主要因素是（ ）

气体的分压差

[单选题]What is probably the best title for the passage?

How to Help Your Child Make Friends

[单选题]Passage TwoThe earliest immigrants to North America found Indians already living there. The Indians numbered about 500,000 at that time. Their society was a primitive society, but they lived peacefully and welcomed the white strangers to the land. However, these early immigrants from Europe didn't want to share the land with the natives. They killed off many of the Indians, seized their land or pushed them off to lands farther away. Today the Indians, not more than halfa million, live in poverty and misery on the land on which they were once masters.

The Indians.

解析：参见本文第一句。

[单选题]关于群落概念的叙述，下列不正确的是（ ）

群落的特征就是植物个体的特征

[单选题]多年生草本植物的生活型为( )

地面芽植物