在4：x=6：15中，若4变成12，则x应变成______比例仍然成立．

心脏听诊内容主要包括()。

A．心音

B．心率

C．心律

D．心脏杂音

E．心脏大小

某一揽子股票组合与香港恒生指数构成完全对应，其当前市场价值为75万港元，且预计一个月后可收到5000港元现金红利。此时，市场利率为6%，恒生指数为15000点，3个月后交割的恒指期货为15200点。（恒生指数期货合约的乘数为50港元）

这时，交易者认为存在期现套利机会，应该（）。

A.在卖出相应的股票组合的同时，买进1张恒指期货合约

B.在卖出相应的股票组合的同时，卖出1张恒指期货合约

C.在买进相应的股票组合的同时，卖出1张恒指期货合约

D.在买进相应的股票组合的同时，买进1张恒指期货合约

下面是一篇应用文及其应用场合的信息，请阅读下列应用文和相关信息，并按照要求匹配信息。

请根据A至F各课程的介绍和个各人的情况说明，选出符合各人要求的最佳选项。

A. A Look at American Literature

A Look at American Literature is a course which gives us a brief outline of American Literature.

B. Works of Some Famous American Writers

Works of Some Famous American Writers show us the introductions to eleven famous writers and their works and also give us some comments on the works.

C. Detailed Reading of American Literature

Detailed Reading of American Literature is a course which focuses on some important and moving details in the works of American literature. It will analyse the detail.

D. Story and Plot

It’s a course which analyses the setting of the main plots in some famous stories. The aim of this course is to help those who want to become writers in the future.

E. Characters and Life

As you know, literature comes from our life, but it’s more than our life. This course will analyze the personalities of some important characters in the world literature, and combine the analysis with our life. It will help us gain wisdom from the characters.

F. Literature Comments

The course is a study of how to write literature comments through some vivid examples.

请阅读以下学生的相关信息，然后匹配他/她和拟要选择的课：

Helen wants to become a famous writer in the future. She is eager to take a course which can help her realize her dream.

Peter was ill last term and missed a lot of lessons in American literature. He wants to take a course which can give him an outline of it.

Kate likes to read literature works and she has many opinions after reading, but she doesn’t know how to express her ideas properly.

Tommy has the basic knowledge of American literature. He wants to take a course which can help him read more famous works about American literature.

Jerry wants to write some articles to show the significance of researching literature today. He is looking for a course which can help him.

待选课程学生                        课程名称

小题1: Helen              A.  A Look at American Literature

小题2:Peter               B.  Works of Some Famous American Writers

小题3: Kate               C.  Detailed Reading of American Literature

小题4: Tommy              D.  Story and Plot

小题5:Jerry               E.  Characters and Life

F.  Literature Comments

什么是煤的干馏？