A：x＞－3
B：x≥－3
C：x≠－3
D：x≤－3
①整体与部分的辩证关系 ②主要矛盾和次要矛盾的辩证关系
③两点论与重点论的统一 ④矛盾的主要方面和次要方面的辩证关系
With the development of science and technology, our daily life is becoming more colorful and more convenient .
An Underwater Hotel
It looks like a spaceship but it is actually a picture of an underwater hotel. A company plans to build in the sea which is about 18 metres below the surface. The whole building is underwater and you can get to it by swimming and diving.
Google Glass
Google Glass is a pair of glasses with a battery hidden inside the frame(边框). It can perform many of the same tasks as smart phones. The glass has a hidden camera and a tiny screen. It is designed to take hands-free photos or videos of anything people are doing.
A New Kind of Shirt
Hate washing clothes? You're going to love this kind of shirt made by an American clothing company, Wool & Prince. This shirt can be worn for 100 straight days without washing! The Wool & Prince shirt never needs ironing(熨烫).
The Digital Library
Can you imagine walking into a library and finding all books have turned into computers? The first bookless public library is planned to open in San Antonio, Texas. Computers will take the place of books soon.
与黄土高原在同一个地势阶梯的是( )
下面是给佝偻病小儿开的药方，其中最科学的一组是（ ）
