问题 单项选择题 A1型题

根据下列解离常数(pKa)判断,在小肠中吸收最好的药物是()

A.苯巴比妥pKa7.9

B.水杨酸pKa3.0

C.乙酰水杨酸pKa3.5

D.磺胺嘧啶pKa6.5

E.麻黄碱pKa9.4

答案

参考答案:E

阅读理解

阅读理解

       When should you start to buy Christmas presents?One week before the day? Two weeks?

Western children start buying presents months before Christmas Day. As the day comes nearer,

children write lists of what presents they want to give and receive.

        Big shopping streets get crowded from late November. Everyone counts down"the number

of shopping days left until Christmas". Stores put up colored lights, and Christmas trees. You will

hear Christmas songs like Jingle Bells in shop after shop. Some stores offer many dolls, stuffed

animals and computer games. You can play with them to see if you like them-there are people to

show you how things work.

       People try to get to the shops early, to buy presents before they sell out. In the week before

Christmas, shops stay open late. Some stores open their doors at 9 am and close them at 9 pm,not

9 am until 5:30 pm as normal. It's very tiring for salespeople !

       Some people save for months before the holiday,to have enough money to spend on their friends

and family. But not everyone goes shopping for Christmas presents. Some people like to make their

own gifts and cards.

1. When should Western children start to buy Christmas presents?

A. December.              

B. November.

C. October.                

D. September.

2. You may see some things in stores during the Christmas season except ___ . 

A. computer games          

B. Jack-O-Lanterns

C. colored lights            

D. Christmas trees

3. People try to get to the shops early to buy presents because         .

A. the shops have many presents

B. the shops stay open late

C. they are afraid to buy no presents

D. the shops are crowded

4. You can go shopping at        in the week beforeChristmas.   

A. at 8 am                

B. at 9 am

C. at 10 pm                

D. at 11 pm

5. The article is mainly talking about         

A. Christmas trees

B. Christmas parties

C. Christmas presents

D. shopping for Christmas

单项选择题