植物病害，粉状物分为哪四种类型？

Part 1

·Read the following passages, eight sentences have been removed from the article.
·Choose from the sentences A-H the one which fits each gap.
·For each gap (1-8) mark one letter (A-H) on the Answer Sheet.
Buzz Aldrin, the second man to walk on the Moon, is a long-time fan of space tourism. Aldrin climbed out of Apollo11 hot on the heels of Neil Armp in 1969. (1)
Together with scientists from Purdue University, the Massachusetts Institute of Technology, and the University of Texas, Aldrin is designing spacecrafts that would perpetually cruise between Earth and Mars. (2) "Some day, people will go to Mars on a regular basis," says team member James Longuski, a professor at Purdue. (3)
The average distance between Mars and Earth is 48 million miles. (4)
It sounds like a trip that would require a lot of fuel. According to the engineers, the cyclers may have a natural, renewable "fuel" supply: from the gravitational forces of the Sun, the planets, and their moons.
As a spacecraft travels close to a planet, its flight path is bent, causing it to whip around the planet and significantly increasing its speed (it’s as if the planet’s gravity gives the passing spacecraft a kick into space). (5) It’s not just science fiction: it might help us get Mars with very little fuel on board, in a journey that would take as little as six to eight months.
"The cycler is essentially in orbit around the Sun and makes regular flybys of Earth and Mars," says James Longuski. "Once you put your vehicle into a cycler orbit, it continues on its own momentum, going back and forth between Earth and Mars. (6)
When the cycler flies by Earth, it will be traveling at a speed of about 13,000 miles per hour.
(7) This is sort of like a bus that doesn’t stop," Longuski says. "When it comes by, you have to run alongside of it and grab on."
AIdrin and his group think that the first cycler could be on its way by as soon as 2018. (8) (It seems a long way off now, but it’s closer than you think!)
Fasten your seatbelts and make sure your seatback is in its upright position. Your flight to space may be departing soon.

• A. These crafts, known as "cyclers", would ferry people and supplies between the two planets, enabling humans to colonize Mars — something that has long been dreamed about in science fiction.
• B. Most people are convinced that we are going to do this; the only question is when.
• C. So, if you’re in middle school now, you could be taking a trip to Mars by the time you’re in your thirties.
• D. To get a sense of just how far this is, try doing this calculation: Given that there are 2,500 miles between New York and Los Angeles, how many times would you have to travel from NY to LA and back to cover the same distance’
• E. Now, at the age of 72, Aldrin is working on a new project that could put more of his fellow humans in space — namely, on journeys to one of our most fascinating neighbors, Mars.
• F. This is the "slingshot" trajectory that you may have seen in movies.
• G. Space taxis will be needed to bring people from the surface of the planet to intercept the cycler.
• H. You may need to carry some propellant for an occasional boost, but it’s pretty much a free trip after that.

证券账户持有人查询证券余额可在办理了指定交易或转托管的次日起，凭“二证”(身份证和证券账户卡)到指定交易或托管的证券营业部办理，或通过证券营业部的电脑自助系统自行完成查询。( )

A．正确
B．错误
C．放弃

某工厂有4个车间，某周是质量检查周，现在每个车间都有a（a＞0）个成品零件，且每个车间每天都生产b（b＞0）个成品零件．质量检查科派出若干名检验员，周一周二检验其中两个车间原有的和这两天生产的所有成品零件，然后，周三到周五检验另两个车间原有的和本周生产的所有成品零件，假如每个检验员每天检验的成品零件数相同，问：

（1）这若干名检验员1天一共检验多少个成品零件（用a、b的表示）？

（2）试求出a的值（用含b的代数式表示）

1900年，20世纪的大幕拉开了，当时的几个世界大国在中国进行了一次很不光彩的集体亮相。和它对应的历史事件是[ ]

A、鸦片战争英国侵华 　　　

B、第二次鸦片战争英法联军侵华

C、甲午中日战争日本侵华 　　

D、八国联军侵华

读图，完成下列要求：（16分）

（1）R河为 ____________河，它主要补给是        和           ，该河流河水流量季节变化较大的主要原因是                                。C河的名称是___________，它主要流经的国家是                   。（6分）

（2）描述A区域降水情况，并分析原因。（4分）

（3）印度棉花分布在德干高原西部，请你评价棉花种植的有利自然条件。（2分）

（4）图中B所在地形区是其所在国年太阳辐射最强，年平均气温最低的地区，试从大气热力过程分析该地区太阳辐射最强，气温低的原因。（4分）