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【单选题】
下列变形正确的是（ ）A.
-x+y x-y = -x-y x+y
B.
-x+y -x-y =- x-y x+y
C.
-x+y -x-y = x+y x-y
D.
-x+y -x-y = x-y x+y
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反馈参考答案：
举一反三
【多选题】What is your purpose to study this course?
A.
To get the score
B.
To learn how to write business letters
C.
To improve English
D.
Other If you make this choice, please tell me what is your purpose by email. Thank you.
【单选题】Which of the following is NOT the principle of writing your purpose statement?
A.
Express your purpose as a statement, not as a question
B.
Choose a specific purpose that is appropriate for your audience
C.
Write the purpose statement as a participial phrase
D.
Avoid figurative language in your purpose statement
【单选题】Using a question to express your specific purpose would _______ .
A.
nlighten your audience
B.
tell no content of your purpose
C.
provide the same function of a statement
【简答题】脑的动脉主要来源?
【简答题】脑的动脉主要来源于 和 。
【单选题】I don't think it was an accident at all. Your brother did it _____. [ ]
A.
for purpose
B.
on purpose
C.
in order
D.
by chance
【简答题】Directions: You have stayed with your friend’s family for a month. Now you are going back home. Write a message to your friend’s family to 1) express your gratitude. 2) show your appreciation of the...
【判断题】' Make your contribution as informative as required (for the current purpose of the exchange).' belongs to the maxim of quality.()
A.
正确
B.
错误
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