问题 填空题

一个直角三角形的两边长分别为3和6,另一个直角三角形的两边长分别为2和4,那么这两个直角三角形______相似.(填“一定”、“不一定”或“一定不”).

答案

∵一个直角三角形的两边长分别为3和6,另一个直角三角形的两边长分别为2和4,

3
2
=
6
4

若两边长分别是直角边,则利用两组对应边的比相等且夹角对应相等的两个三角形相似;

若此两边是直角边与斜边,则利用直角三角形中直角边与斜边对应成比例,两直角三角形相似,证得.

∴这两个直角三角形一定相似.

故答案为:一定.

填空题
阅读理解

There are thousands of products of all colors and shapes in a supermarket, making you believe that they are worth a try. How? Packaging (包装)is the silent but persuading salesman.

There on the shelves, each bottle, can, box, and jar has been carefully designed and measured to speak to the inner self of the consumer(消费者), so that is buying not only a product but also his belief in life. Scientists have studied consumer behavior recently and found that the look of the package has a great effect on the “quality” of the product and on how well it sells, because “Consumers generally cannot tell between a product and its package. Many products are packages and many packages are products,” as Louis Cheskin, the first social scientist studying consumers’ feeling for packaging, noticed.

Colors are one of the best tools in packaging. Studies of eye movement have shown that colors draw human attention quickly. Take V8 for example. For many years, the bright red color of tomatoes and carrots on the thin bottle makes you feel that it is very good for your body. And the word “green” today can keep food prices going up.

Shapes are another attraction. Circles often suggest happiness and peacefulness, because these shapes are pleasing to both the eye and the heart. That’s why the round yellow M signs of McDonald’s are inviting to both young and old.

This new consumer response(反应)to the colors and shapes of packages reminds producers and sellers that people buy to satisfy both body and soul.

60.According to the passage, ______ seems to be able to persuade a consumer to buy the product.

A.the pleasing color of the package    B.the special taste of the product

C.the strange shape of the package     D.the belief in the product

61.If a package or a product is round in shape, it can ________.

A.bring excitement to the consumers  B.attract the consumers’ attention

C.catch the eye movement of the consumers   D.produce a happy and peaceful feeling

62. “And the word ‘green’ today can keep food prices going up.” This sentence suggests that consumers today are ________.

A.starting to notice the importance of new food

B.enjoying the beauty of nature more than before

C.beginning to like green vegetables

D.paying more attention to their healthy

63.It can be inferred from the passage that V8 is a kind of ________.

A.vegetable dish  B.healthy juice    C.iced drink D.red vegetable