[单项选择]There is little air on ______ moon.
[A] the [B] a [C] /

[单项选择]Little疝
A. 疝内容物为部分肠壁
B. 疝内容物为小肠憩室
C. 疝内容物为单个小肠肠管
D. 疝内容物为大网膜
E. 疝内容物为多个小肠肠襻

[简答题]air carriers

[单项选择] Air Pollution When people think about air pollution, they usually think about smog, acid rain, CFC’’s, and other forms of outdoor air pollution. But did you know that air pollution also can exist inside homes and other buildings It can, and every year, the health of many people is affected by chemical substances present in the air within buildings. A great deal of research on pollution is being conducted at laboratories and universities. The goals of the research are to find solutions and to educate the public about the problem. Two places where this type of work is being done are LBNL and the University of California, Berkeley. Let’’s take a closer look at the various types of air pollution, the effects that they have on people, and what is being (or not being) done to correct the problem. What Is Air Pollution Air is the ocean we breathe. Air supplies us with oxygen which is essential for our bodies to live. Air supplies us with o
A. Y
B. N
C. NG

[简答题]inadequate air conditioning

[简答题]air fare quotations

[填空题]What’ s the speed of little cars These little cars can only go ___________ per hour.

[填空题]
Air services in the USA are generally excellent and relatively inexpensive, and travel by air is a very convenient way of getting around such a large country. There are often cut-price arrangements that foreign visitors are able to get, especially if you book before you leave home, but these change from year to year, so you should check with a travel agent. There are also, from time to time, price-cutting wars and other competitive struggles between the different internal airlines, so it is sensible to make inquiries about what the best deals are at any given time. (American travel agents will know better about these. ) It may well be that some airlines are offering better prices or better arrangements than others for the particular journey you want to make. Note that in America a return ticket is called a "round-trip" ticket, and a single ticket is called "one-way" ticket.
Major Internal Airlines