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近几年我县大力发展生态农业，下图是在玉米、鸡、猪、人组成的食物网基础上建立的生态农业示意图．鸡、猪、人的粪便以及玉米秸秆通过沼气池发酵，产生的沼气用于照明和做饭，沼渣做肥料，使能量持续高效地流向对人类最有益的部分．请识图回答： （1）此人工生态系统的所有能量实质都来自于______． （2）在此生态系统中最基本、最关键的生物组成成分是______．此生态系统一共有______条食物链，写出人获取能量最多的食物链______．在此生态系统中能将鸡、猪、人的粪便以及玉米秸秆通过沼气池发酵产生沼气的微生物，在生态系统成分中属于______．
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【判断题】判断题 (认为下列观点为 Facts 请选择 正确; 认为下列观点为 opinions 请选择 错误) 23. The number of people who have high credit card debt is astonishing.
A.
正确
B.
错误
【单选题】GPS系统中的车载台由GPS接收机、GPS控制系统、GSM通信系统组成。其中功能是实现自主定位的部分是（ ）
A.
GPS接收机
B.
GPS 控制系统
C.
GSM 通信系统
D.
计算机系统
【简答题】Are You Buying It? To many people, debt is an inevitable part of life. In President Bush’s first official Tax Cut proposal he noted that the average family in the United States carries a credit card d...
【简答题】Although the author is usually an optimistic person, the seriousness of his credit card debt problem let him down.
【单选题】Which of the following is a disadvantage of a second mortgage compared to credit card debt?
A.
The loans are secured by the borrower's home.
B.
The borrower gives up the tax deduction on the primary mortgage.
C.
The borrower must pay points to get a second mortgage loan.
D.
The borrower will find it more difficult to qualify for a second mortgage loan.
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