问题 填空题
有一道解三角形的题,因为纸张破损,在划横线地方有一个已知条件看不清.具体如下:在△ABC中角A,B,C所对的边长分别为a,b,c,已知角B=45°,a=
3
,______,求角A.若已知正确答案为A=60°,且必须使用所有已知条件才能解得,请你写出一个符合要求的已知条件.
答案

根据题目的要求,只要知道了c边,使用所有已知条件才能解得此三角形,由于正确答案为 A=60°,故

B=75°=45°+30°,根据正弦定理

3
sin60°
=
c
sin(45°+30°)
,解得   c=
6
+
2
2

故 一个符合要求的已知条件可以是 c=

6
+
2
2

故答案为:c=

6
+
2
2

多项选择题
阅读理解

阅读表达。阅读下面短文并回答问题,然后将答案写到答题卡相应的位置上(请注意问题后的词数要

求)。

     [1]It is now possible to watch live sport on television on any day of the week, and the current amount of

reporting will undoubtedly increase further in years to come. This is certainly having an influence on the live

sports events themselves, and there are both benefits and shortcomings to this.

     [2]Why has there been such growth in televised sport? For one thing, with digital broadcasting, there are

now many more TV channels than there were even ten years ago. Moreover, sport has become an important

form of entertainment, appealing to both men and women.

     [3]When are the benefits of this state of affairs? One obvious advantage to the profession is the addition

of money provided by television companies. Large football clubs benefit financially from TV income and the

top players can command very large salaries. Less popular sports also receive money that can be used in

training and awareness-raising. What's more, there is a health benefit to some of the population, because

through televised sport, more people have become interested in actually playing sport.

     [4]However, _____ if so much sport is on television. Considering football again, many small clubs have

suffered financial losses recently, as they cannot compete with the large ones. There has been a general falling

in ticket sales, especially among smaller clubs. Fewer people attend live matches nowadays, preferring to

watch from the comfort of their living room. And ticket prices have risen greatly.

     [5]To sum up, while televised sport has created many opportunities and benefited certain people and clubs

very much, it has also been responsible for changing the nature of live sports events for ever.

1. What is the main idea of the text? (no more than 8 words)

    _______________________________________________________________________________

2. Complete the following statement with words from Paragraph 2. ( no more than 3 words)

    There has been a great increase in TV channels in the past few years with the help of

    _______________________________________________________________________________

3. Point out the advantage of televised sport which does not concern money in Paragraph3. (no more

    than 3 words)

    _______________________________________________________________________________

4. Fill in the blank in Paragraph 4 with proper words. (no more than 6 words)

    _______________________________________________________________________________

5. What does the word "it"  (Line2, Paragraph5) probably refer to? (no more than 3 words)

    _______________________________________________________________________________