题目内容：
根据以下材料，回答题Test is usually carefully designed for a specific purpose and consists of one or more tasks each with a clear objective. We use tests to assess people's present progress in how well they can do against certain stan-dards. One thing in common among the commonly used tests is that they all try to evaluate learners language
ability.
Progress test is used to find out how well learners are doing after a lesson or unit is finished and is for the teacher to check learning and to decide if extra work is needed so that for the students those who need it.
The test focuses only on what learners have recently been introduced and practiced.
Course test or weekly, monthly test also aims at checking how learners have done over a whole course.These are the commonest basis for the marks teachers give learners at the end of each course.They are very significant for learners. They are also the main concern in testing for teaching and learning.The test used to determine learners' general level of proficiency in relation to the reputation of certain standards is proficiency test. For example, the national English Curriculum Standard. The result is also use-ful for evaluating teaching and learning in different school.
At the beginning of a school year or the start of a program, placement test is usually used. The purpose is to learn about learners current level of language ability in order to decide what put them into appropriate levels of classes. Therefore,their later progress can be appropriately assessed.
Give a very brief answer to the following question :
What does the writer of the passage intend to argue about the four tests?
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