试述亚洲货币市场发展较快的原因。

 短文改错（共10小题; 每小题1分，满分10分）

Dear Ken,

I’m writing to tell you everything about my                              1．      

hometown. I live in Briton, a small town, where has a                        2．     

population of around 30,000. It is in the coast about 50                       3．     

miles from London. It isn’t so interesting like London,                        4．     

and the air is much cleaner. There is little pollution.                            5．     

There’re many hotels and language schools here.                                 6．     

In summer it is full with travelers. My father used to                           7．     

working in a steel plant before he lost his job. He                               8．     

wanted to open a small shop, but he’s short of money.                         9．     

He wonders that if he can borrow some money from the bank.             10．     

Best regards,

Janet

设⊕是R上的一个运算，A是V的非空子集，若对任意a，b∈A，有a⊕b∈A，则称A对运算⊕封闭．下列数集对加法、减法、乘法和除法（除数不等于零）四则运算都封闭的是（　　）

A．自然数集

B．整数集

C．有理数集

D．无理数集

Shanghai will host the World Expo _____May.[ ]

A. in    

B. on    

C. to    

D. at

人的血液中碳酸酐酶的一个分子，每分钟可催化分解1900万个碳酸分子，这说明酶具有（）

A.专一性

B.多样性

C.高效性

D.稳定性

关于子宫内膜异位症，下列哪一项不正确：

A．卵巢子宫内膜异位症约50%以上累及双侧卵巢

B．囊内含巧克力样陈旧性血液

C．囊肿多与周围组织紧密粘连

D．囊肿声像图表现不随月经周期变化

E．囊肿直径一般为5cm——6cm，最大可达25cm