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【单选题】
已知E(X)=-1，D(X)=3，则E[3(X 2 -2)]=( )．A.
9
B.
6
C.
30
D.
36
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反馈参考答案：
举一反三
【单选题】What’s the main idea of this reading?
A.
English words in other languages.
B.
Words from India.
C.
The usage in English of words from other languages.
D.
How the word shampoo was first used in English
【简答题】什么是UNI?UNI包括哪些内容?
【简答题】For a person with good reading habits, a (print)page contains not only words but ideas, thoughts and feelings.
【单选题】You can enlarge your vocabulary by _________.
A.
reading more books
B.
finding new words in dictionaries
C.
writing more
D.
using the words in everyday life
【单选题】The more words you are familiar with, the less you are aware of reading words and ________ you are aware of content and meaning.
A.
more
B.
less
C.
the more
D.
the less
【单选题】I would rather _____ English than ______ words.
A.
reading,write
B.
read,writing
C.
read;write
D.
reading;writing
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