《2025年快乐过暑假江苏凤凰科学技术出版社八年级提优版》

7. 我们知道,菱形和正方形虽然都是四边相等的四边形,但形状有差异,可以将菱形和正方形的接近程度称为菱形的“神似度”. 如图,在菱形 $ABCD$ 中,对角线 $AC$、$BD$ 的长分别为 $a$、$b(a\geqslant b)$,我们把 $\frac{a}{b}$ 定义为菱形的“神似度”.
(1)当菱形的“神似度”= ______1时,菱形就是正方形；
(2)当 $\angle BAD = 60^{\circ}$ 时,求菱形 $ABCD$ 的“神似度”.
$\quad$ $\sqrt{3}$

答案：
(1) 1
(2) $\sqrt{3}$

一 选用方框内的单词或词组填空,其中有一个单词或词组是多余选项
exercise unable to spend working cost tiniest
1. Though we were tired, we continued working till the midnight.
2. The poor boy was born with an illness that made him unable to hear and see.
3. This is the tiniest toy I have ever seen.
4. If you want to finish the whole ride, you should manage to exercise more to be stronger.
5. We're talking about where to spend our coming summer holiday.

答案： 1. working 2. unable to 3. tiniest 4. exercise 5. spend

Top Tips for Better Writing
There are many different types of writing, such as essays(文章), letters and speeches. Here are some tips that will help you improve your writing.
Be clear about your purpose
The most basic question to ask yourself before you start is why you are writing. In an essay or assignment, your purpose is to convey(传递) information and draw conclusions. 1.F
Start with a plan
2.DWhatever you are writing, creating a clear plan is the first step to getting your message in the most effective way.
Guide readers through what you write
Your task is to help readers understand your message quickly and correctly. 3.BEach sentence and each paragraph should be relevant(相关的) to what comes before and what comes after.
4.A
Your aim in writing is to communicate ideas and information to other people, and you must keep that in mind with every word and sentence you write. Remember to ask yourself who you really write the information for.
Write for the ear, not for the eye
Once you've finished a draft(草稿) of your speech, practise reading it out loud. 5.ERevise(修改) so you are more comfortable giving your speech.

答案： 1. F 2. D 3. B 4. A 5. E