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【单选题】
设事件A，B仅有一个发生的概率为0.3，且P(A)+P(B)=0.5, 则A，B至少有一个不发生的概率为 ( )A.
0.7
B.
0.6
C.
0.9
D.
0.8
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反馈参考答案：
举一反三
【单选题】Evaluation helps determine the extent to which have been achieved.
A.
Efficiency
B.
Profit
C.
Training objectives
D.
Employee satisfaction
【单选题】听力原文：W: Do I need to take some medicine? M: Yes. And I strongly advise you to go on a low-fat diet. W: Do you really think that's important? M: Definitely. If you don't, you might have a heart attack ...
A.
Father and daughter.
B.
Husband and wife.
C.
Doctor and patient.
D.
Teacher and doctor.
【单选题】听力原文：W: Do I need to put more stamps on this letter? It has to go to Los Angeles. M: No, if it's sent by ordinary mail. Express mail is faster, but more expensive. W: Well, I'd like it to go as soon a...
A.
Whether she has any letters.
B.
If she has used enough postage.
C.
How soon a parcel will be delivered.
D.
Where to find a mail box.
【单选题】听力原文：W: Do I need to take some medicine? M: Yes. And I strongly advise you to go on a low-fat diet. W: Do you really think that's important? M: Definitely. If you don't, you might have a heart attack ...
A.
Doctor and patient.
B.
Husband and wife.
C.
Father and daughter.
D.
Shop assistant and customer.
【简答题】一个算法具有5个特性: (1) 、 (2) 、 (3) ,有零个或多个输入、有一个或多个输出。
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