题干

我国梨果资源非常丰富。20世纪末,梨园用工劳力亩成本年约100美元,而同期日本、美国分别约为3 000美元、1 800美元。我国梨果单位面积产量远低于世界平均水平;一家一户的生产体制,栽培面积小,技术水平差别很大,大多数果实混级贮运。我国发展梨果业的限制性区位条件是(  )

①产业化水平低       ②果农科技文化素质低  ③政府不支持    ④品种老化

A:①②③

B:①②④

C:②③④

D:①③④

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答案(点此获取答案解析)

B

同类题4

    We use the Internet for many things: business, shopping, writing letters, talking to people, finding information, and so on. In recent years, a new kind of English has grown on the Internet. There's no real word for it yet, so we'll call it e-talk. People don't like typing too much. To save time, they turn phrases (短语) into a few letters called acronyms(首字母缩略词). Acronyms are often used in chat rooms.
Some of them are:
BTW(by the way)     BRB (be right back)
LOL (laughing out loud) IMO (in my opinion)
People also use many abbreviations. They are shortened forms of words. Some common abbreviations are:
info (information)    puter (computer)    pic (picture)      sec (second)
We usually don’t see people when we communicate on the Net, so people have new ways to show feelings. Most people use their keyboards to draw “feeling”, such as:
: ) (happy)     :-( (sad) ;    : P (joking)   : O (surprised)
These days, many forums have picture feelings. For example:
happy          sad         angry        cool
There are even whole new words, like ‘newbie’ (someone who is new on a chat board or forum). When you write something bad about someone else, it’s called ‘flaming’ the person.
It takes time to get used to e-talk. Also, different groups in the Net have their own special ways of communicating. Newbies sometimes have to ask other people what they mean. As the Internet grows, e-talk will continue to grow and change.