问题 填空题

已知凸四边形ABCD的四边长为AB=8,BC=4,CD=DA=6,则用不等式表示∠A大小的范围是______.

答案

∠A越大,BD的距离越大.但是BD<BC+CD=4+6=10,

所以当∠C趋近于180度时,BD最大值接近10,

102=82+62

∠A最大90度但不能等于90度,

∠A最小可以趋近0度,这时BD最小值=AB-AD=2,

∠BCD中BC距离最小值也是2,

这时∠C也趋近0度,

∠B趋近180度,

故0<∠A<90°,

故答案为0<∠A<90°.

完形填空

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。其中有两项为多余选项。注意:请将1题至5题的答案写在第二卷对应的横线上。

__     1      

What would you be like if you were to take the college entrance exam tomorrow?     2   ____Or, worried and uneasy?

"I was surprised at how I could get angry so easily with my parents before a big exam, " said a senior 3 student Wang Yangqian from Beijing."I couldn’t fall asleep even after I’d been in bed for two hours."

Not only exams but also other things, like a big game, can make you different from how you are usually.You may act differently because you are stressed out.What is stress?     3      Usually your hands get wet and your heart beats faster.You feel stressed because you might ask too much of yourself sometimes.Or, your parents, teachers or classmates put too much pressure on you.This can make you worried.But being stressed is not always a big problem.Everybody, even sports stars, can get a little worried before a big game.

Some kinds of stress are good.Good stress might show up when you’ re called on in class or when you have to give a report.     4       You may do a better job in your book report if the anxiety pushes you to do more work before you read it to the class.

Sometimes stress can turn into something bad if you keep having stressful feelings for a long time.This kind of stress isn’t going to help you.It can make you sick.     5     

Remember to stay relaxed.It won’t be the end of the world, even if you don’t pass the exam.

A.Peaceful and happy as usual?

B.This kind of stress can help you get things done well.

C.Stress can push you to meet your deadline.

D.Stress can be good or bad for people. E.You may feel stressed when you ask for too much help.

F.It can also prevent you from working harder.

G.Stress is what you feel when you are worried or uncomfortable about something.

多项选择题