问答题A typist types four envelopes and four letters. She places the letters in the envelopes at random. What are the chances that only three letters are in their correct envelopes?

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问答题

A typist types four envelopes and four letters. She places the letters in the envelopes at random. What are the chances that only three letters are in their correct envelopes?

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相似问题和答案

第1题：

We haven't seen such a beautiful film().

A、since four years

B、for the past four years

C、four years ago

参考答案：B

第2题：

From the passage, how many places have the name Valencia?

A. One.

B. Two.

C. Three.

D. Four.

正确答案：C
39．答案为C 此题为综合细节题。问题提出有几个地方的名字都是瓦伦西亚?在文章中数数可以知道一共是三处，故选C。

第3题：

There are four types of blood, all types are found in every race.()

此题为判断题(对，错)。

标准答案:对

第4题：

Which four are valid Oracle constraint types? ()

A. CASCADE

B. UNIQUE

C. NONUNIQUE

D. CHECK

E. PRIMARY KEY

F. CONSTANT

G. NOT NULL

参考答案：B, D, E, G

第5题：

A deer has four ______ , doesn't it?

A、foots

B、feet

C、feets

D、foot

参考答案： B

第6题：

She has stored ______books as I.

A. three times as many

B. three times as much

C. four time as many

D. three time as much

正确答案：A

参考译文：她的藏书是我的三倍。此题考查倍数表达法。英语中的倍数表达法为“X times as many/much Y as”，其中X为数字，Y为名词，如果Y为可数名词则用many，如果Y为不可数名词则用 much。根据此规则可知正确答案为A。

第7题：

—Does Jenny have four sisters and brothers?

—No，she_______ (not)．

正确答案：
38. Doesn’t

第8题：

PDM includes four types of dependencies or precedence relationships: (). The completion of the successor activity depends upon the initiation of the predecessor activity.

A.Finish-to-Start

B.Finish-to-Finish

C.Start-to-Start

D.Start-to-Finish

参考答案：B

第9题：

His father is ________ than his mother.

A.older four years

B.as four years older

C.four years older

D.four years bigger

参考答案：C

第10题：

She ____ till four or five in the morning to get all the clothes ready for her son’s wedding.

A、recover

B、build

C、sewed

D、depend

正确答案:C

A typist types four envelopes and four letters. She places t

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