如图是飞机空中加油情景，受油机B速度为1000km/h，则加油机A以受_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题填空题

如图是飞机空中加油情景，受油机B速度为1000km/h，则加油机A以受油机B为参考物的速度是______；若加油机以地面为参照物的速度是______．

答案

加油机A以受油机B为参考物，加油机是静止的，速度是0；加油机A与受油机B运动的方向相同、速度相同．所以以地面为参照物，加油机的速度也是1000km/h．

故答案为：0；1000km/h．

阅读理解

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Expert: Science Adviser - <>3/21/2011

QUESTION: Dear Marie,
Do you have some good suggestions of biology: plant, animal, human science experiments that would work well with teenagers? Scientific methods must go with the experiments. Thanks! <
Donna
ANSWER: Dear Donna,
Marie is not online and I’ll help you instead of him. There are a lot of little things that can be done, but do you mean lab experiment or statistical analysis, etc.? Let us know what can be suitable for you teens, and we will do our best to send you some experiments to do.
Best，
Gloria

Expert: Science Adviser - 3/23/2011

QUESTION: Dear Gloria,
I need lab experiments. The teenage students and I will use data from these experiments to make charts, graphs, tables, etc. and to provide claims and evidence to explain more about the results. Thank you very much.
Donna
ANSWER:
Hi there,
Your best and easiest way is to do some chemistry experiments. Those are very easy and most probably you can do it in the lab and have charts, etc. for you. I do not have any particular one at the top of my head because I do cancer research and it is a bit more difficult than research for teenagers. I think you can look through these and see if you find something useful for you. http://www.siraze.net/chemistry/sezennur/experiments.htm
If not, get back to me and Marie, and we’ll look more. The good thing about this site is that it has the procedures that you can follow.
Good luck，
Gloria

小题1:How many Science Advisers are there working for this website?

B．At least two.

C．About three.

小题2:According to Donna, she and the teenage students need ___________.

A．experiments in the lab	B．statistical analysis
C．chemistry experiments	D．charts and evidence

小题3:Who is this text for?

小题4:According to Gloria, Donna and the teenage students should __________.

A．turn to others for help	B．do cancer researches
C．look through a website	D．tell who will be helped

判断题

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