实验动物笼器具没有标准，应按勤俭节约、就地取材的原则制作。_爱下问搜题

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问题判断题

实验动物笼器具没有标准，应按勤俭节约、就地取材的原则制作。

答案

参考答案：错

单项选择题

对于产甲烷阶段过程描述不正确的是( )。

A．(A) H₂可还原CO₂合成CH₄

B．(B) 乙酸脱羧生成CH₄和CO₂

C．(C) 甲酸、甲醇及甲基胺可裂解生成CH₄

D．(D) 大部分的甲烷来自氢的氧化和二氧化碳的还原

完形填空

Some people will do just about anything to save money. And I am one of them. My family’s last vacation was a good         to prove it. It was my six-year-old son’s winter break from school, and we were         home from Fort Lauderdale after a week-long trip. The flight was        , and Delta, the airline, offered us $400 per person in credits to give up our seats and leave the next day. I had meetings in New York, so I had to        . But that didn't mean my husband and my son couldn't stay. I took my nine-month-old and took off for home.
The next day, my husband and son were offered more         to take an even later flight. Yes, I encouraged — okay, ordered — them to wait it out at the        , to "earn" more Delta Dollars. Our total take: $1,600. Not bad, huh?
Now some people may think I'm a bad mother and not such a great wife either. But as a big-time bargain hunter, I know the value of a        . And these days, a good deal is something few of us can afford to        .
I've made living looking for the best deals and         the worst tricks. I have been the consumer reporter of NBC's Today show for over a decade. So far, I feel proud that I have written a couple of         including one titled Tricks of the Trade: A Consumer Survival Guide. And I really do what I         in.
I tell you this because there is no         in getting your money’s worth. Honestly, I’m also         when it comes to shoes, clothes for my children, and expensive restaurants. But I wouldn't hesitate to spend on a good haircut. It keeps its shape longer, and it's the first thing people        . And I will also spend on a classic piece of furniture.         lasts.

B．overcrowded

D．overpowered

A．dictionaries

B．tightfisted

A．Satisfactory