在一个长20米，宽8米，深1.5米的长方体蓄水池里面贴瓷砖，瓷砖是边长为0.2米

下列说法正确的是[ ]

A.氧化还原反应的本质是元素化合价发生变化

B.还原剂是一种能够得到电子的物质

C.物质所含元素化合价升高的反应是还原反应

D.氧化反应和还原反应是同时发生的

照样子，组词。

例：咨询——询问——问题——题目

简朴——（       ）——（       ） ——（       ）  

悼念——（       ）——（       ） ——（       ） 

2011年5月14日，成都两位城管暴打一位在大街上占道经营卖杨梅的老大爷，此举遭多位美女围堵，很多市民围观并声讨谴责，请评价他们的行为[     ]

A．成都美女的行为是合法行为

B．老大爷的行为是合法行为

C．美女的行为维护了社会公平和正义

D．市民围观是非正义的行为

组织合理运输的方针有______

A．迅速

B．安全

C．准确

D．节省

E．方便

     An American space company says a powerful new rocket should be ready for a test launch by the

end of 2012. The company is Space Exploration Technologies, or SpaceX. Its new rocket is called the

Falcon Heavy.

     Company officials say it'll be able to transport satellites or spacecraft weighing up to 53 metric tons

into orbit. Fiftythree metric tons is 117,000 pounds. That load weight is double the capacity of NASA

space shuttles. The space agency is retiring its shuttles after thirty years.

     Elon Musk is the chief executive officer of SpaceX. He says the Falcon Heavy will be the second

most powerful rocket ever. He says it was designed to carry satellites and other equipment into space.

He says the rocket was designed to meet NASA's ratings for human flight safety. So it could someday

be used to carry astronauts and other travelers into space.

     Mr. Musk says the Falcon Heavy could also be used for missions(任务) like carrying a robotic lander

to collect samples from Mars. He says, "It has so much more capability than any other vehicle that I think we can start to consider missions like a Mars sample return, which requires a tremendous amount of lift

capability because you've got to send a lander to Mars that still has enough propellant(推进物) to return

to Earth."

     The first launch is planned from the company’s launch site at Vandenberg Air Force Base in California. A launch from Cape Canaveral, Florida, is expected in late 2013 or 2014.

     In time, SpaceX hopes to launch ten Falcon Heavy rockets a year. It says the rocket should cut back

on launch costs to about 2,000 dollars a kilogram.

     SpaceX already has a billionandahalfdollar deal with NASA to use a smaller rocket to transport

cargo(货物) to the International Space Station. The rocket is the Falcon 9, and the deal is for after the

two last shuttles-Endeavour and Atlantis-are retired this year.

1. What do we know about the feature of the new rocket from the second paragraph?

(No more than 11 words)

________________________________________________________________________

2. Why did SpaceX want to design the new rocket？(No more than 16 words)

________________________________________________________________________

3. Why can the new rocket be used to carry a robotic lander to collect samples from Mars?

(No more 6 words)

________________________________________________________________________

4. What will SpaceX do for the NASA after Endeavour and Atlantis are retired?

(No more than 14 words)

________________________________________________________________________