配对阅读。左栏是5个人想做的事情，请从右栏为每个人选择最合适的一项，并将答案的字母编号填写在题前。

小题1: Carol is an assistant in a company. She is interested in English and wants to buy some newspapers to read so that she can improve it.

小题2: Mr Smith wants to travel to Africa. He wants to get some information about the climate and the culture in Africa.

小题3: Linda wants to know something about the inventions such as shoes with adjustable heels.

小题4: Helen hopes that she can give some help to the people who lost their home in the flood.

小题5: Lily doesn’t want to stay at home and read books all day during the winter holiday. She plans to take some lessons on singing.

氨茶碱的主要平喘机制为（）

A.直接舒张支气管

B.抑制磷酸二酯酶

C.激活鸟苷酸环化酶

D.抑制腺苷酸环化酶

E.促进肾上腺素的释放