被称为眼球“血库”，含色素丰富，对眼球有遮光作用并具有免疫功_爱下问搜题

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问题单项选择题

被称为眼球“血库”，含色素丰富，对眼球有遮光作用并具有免疫功能的是（）

A.角膜

B.虹膜

C．玻璃体

D．脉络膜

E．视网膜

答案

参考答案：D

阅读理解

阅读理解。

Su Hua is studying at Cambridge, UK. She has bought a bicycle and is worried about security ( 安全). Her friend, Kate, found this article and sent it to her.

     Introduction
     A lot of crime is against bicycles. About 150,000 bicycles are stolen every year and most are never
found. You can prevent this happening by following a few careful steps.
     Basic Security
     Do not leave your bicycle in out-of-the-way places. Always lock your bicycle when you leave. Secure
it to lampposts or trees. Take off smaller parts and take them with you, for example lights and saddles (车座).
     Locks
     Get a good lock. There are many different types in the shops. Buy one that has been tested against
attack. Ask for a recommendation from a bike shop.
     Marking
     Security marking your bike can act as a deterrent to a thief. It can also help the police find your bicycle. It should be clearly written and include your postcode and your house or flat number. This will provide a
simple way to identify your bicycle.
     Registration
     There are a number of companies who will security mark your bicycle for you. They will then put your
registration number and personal details on their computer database. Then if your bicycle is found it will be easy to contact you.
     Finally
     Keep a record of the bicycle yourself： its make, model and registration number. You can even take
a photograph of it. This will prove the bicycle belongs to you.

1. Which part of the text gives you information on how to lock up your bicycle when you leave it?

A. Locks.
B. Marking.
C. Registration.
D. Basic Security.

2. The underlined phrase “act as a deterrent to a thief” means ______.

A. help you recognize your bike
B. help the police find your bicycle
C. stop someone stealing your bicycle
D. stop you worrying about your bike

3. The article advises you to keep a record of your bicycle _______.

A. in the bike shop and your computer
B. in the police station and a security company
C. in a security company and your university
D. by yourself and in a security company

4. The main purpose of this article is _________.

A. to tell you what to do if your bicycle is stolen
B. to suggest ways of keeping your bicycle safe
C. to give you advice on where to buy a good lock
D. to say why you shouldn’t keep your bicycle in a quiet place

问答题

于某，男，68岁，农民，种地为生，现住农村老家，老伴在三年前去世了，有一儿子，大学毕业后留在了城里工作。老人年岁高，走路不太灵活，除了夏天在小院子里种点小菜以外，平时很少外出，耕地也包出去了。儿子很孝心，多次劝说老人到城里与他一起生活，但老人说什么也不去，说住城里不习惯，也帮不上儿子的忙，只会给儿子带来麻烦，打扰儿子的生活。老人每天没事可做，多半时间都孤单地坐在院子里。

[问题]

结合案例来说明老年人都会遇到哪些具体问题。