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【单选题】
某事故树的最小径集为：Pl＝{Xl，X2，X4}，P2＝{Xl，X2，X5}，P3＝{Xl，X3，X6}，P4＝{Xl，X3，X7}，则结构重要程度为（）。A.
I（1）＞I（2）＝I（3）＞I（4）＝I（5）
B.
I（1）＞I（2）＜I（3）＞I（4）＝I（5）
C.
I（1）＞I（2）＞I（3）＜I（4）＝I（5）
D.
I（3）＞I（2）＜I（1）＞I（4）＝I（5）
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【简答题】______ The purpose of this passage is to explain why it is necessary for us to help others.
【简答题】What did the writer explain at the end of the letter? Why their reply would not ______.
【简答题】Is English a language that uses a phonetic alphabet system? Explain briefly why or why not with examples.
【单选题】Why does the author mention particle physics and art galleries?
A.
To explain why they need government support.
B.
To emphasize the importance of maintaining them.
C.
To give reasons why their existence would be necessary.
D.
To argue that encouraging young people to go into applied fields is important.
【简答题】Can you explain why people buy stock on margin?
【单选题】Why does the professor say this:
A.
To explain why people need to talk to psychologists
B.
To give examples of cultural differences in grieving
C.
To show that death causes people to do strange things
D.
To describe the final stage in the process of grieving
【单选题】The pesticides and the smell of manure are mentioned to ______.
A.
explain why newcomers complain to the council.
B.
introduce the place in which cowboys live.
C.
explain why smaller players become victims.
D.
explain why cattlemen are moving out to remoter parts of the state.
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