问题 单项选择题

北京黑夜最长时,地球运动至( )

A.①

B.②

C.③

D.④

答案

参考答案:C

解析:分析:地球公转的方向是自西向东,公转的周期是一年,公转产生的地理现象是:①昼夜长短的变化;②四季的形成.解答:地球围绕太阳公转时,地轴与公转轨道的平面成66.5°的固定倾角,这就使得一年内太阳光线的直射点有规律地在南北回归线之间移动.北京位于北半球,在冬至的时候黑夜最长,结合图示中,地球运行至③位置时,太阳的直射点在南回归线上,为北半球的冬至日,此时白昼时间最短,黑夜最长.点评:本题考查了地球公转产生的现象,属基础题.

阅读理解

阅读理解。

     The iPad is an Apple tablet computer. The device sits somewhere between a laptop and a

smart phone, according to Apple's chief executive, Steven P. Jobs, and does certain things better

than both of them, like surfing the Web, reading e-books and playing videos. The iPad went on

sale on April 3, 2010, and Apple said it had shipped 500,000 units in the first week. The handheld

device puts Apple on a direct collision course with the Kindle from Amazon, which Mr. Jobs ever

considered as pioneering the category.

     It is common knowledge that media companies hope the iPad will finally lead to available way

for them to charge for news, books and other materials. The half-inch thick, 1.5-pound device

features a 9.7-inch multi-touch screen and is powered by a customized(订制的)Apple microchip,

which is called A4. It has been designed with an exposed screen and without a camera or separate

keyboard. The iPad has the same operating system as the iPhone and also has access to its 140,000

applications.

     The price of the device starts at $499 for the most basic model, with a Wi-Fi wireless connection.

More expensive models with more memory and with 3G wireless access will cost $629 to $829,

depending on storage size.

     Because Apple is attempting to popularize a new kind of computing device, acceptance among

consumers is expected to be slower than with previous Apple devices. Critics assume that some

buyers are waiting for future versions of the iPad to appear, perhaps with a camera or USB ports

(端口).

     On its first day on sale, iPad users downloaded more than one million applications from the

company's AppStore and more than 250,000 electronic books from its iBookstore. A new wave

of apps is expected in response to the iPad. For an application developer, having an application

accepted for a highly desired Apple product means reaching a passionate group of consumers.

The potential income is huge: the apps market for the iPhone and iPod Touch alone is already

worth a billion dollars a year in sales.

1. In Mr Job's opinion, the iPad              .

A. is a standard computer

B. is better than a laptop in any function

C. helps Apple to beat Amazon

D. is a "revolutionary" product between a laptop and a smart phone

2. Which of the following is NOT true of the iPad?

A. It is expected to benefit media companies.  

B. It has a lot of similar features to a laptop.

C. It has a virtual keyboard.                

D. It has the fastest Apple microchip.

3. The different prices of the iPad are determined by              .

A. the size of the screen

B. the size of the memory

C. the speed of the microchip

D. the Wi-Fi wireless connection

4. What do we know from the fourth paragraph?

A. Some consumers hope for an iPad with more functions.

B. Buyers can improve their iPads with USB devices.

C. The iPad is basically different from conventional computers.

D. The iPad is accepted faster than former Apple products.

5. It is implied in the passage that              .

A. people may download any application from the App Store

B. people would prefer to buy an iPad rather than an iPhone

C. owning an Apple product means that you will be respected

D. the Apple company will make more profit from the iPad

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