【单选题】【消耗次数：1】
The president has an ____________ secretary.
①
extensive
②
efficient
③
effective
④
expensive
参考答案：
复制
纠错
相关题目
【单选题】
I asked the secretary if there were ______ tickets but she had only the expensive ______.
①
one, ones
②
any, one
③
some, ones
④
any, ones
【多选题】
Computers are __________ more efficient than human beings.
①
many
②
much
③
less
④
far
【单选题】
In _____________ banking, we make extensive use of computers.
①
modern
②
ancient
③
old
④
classical
【单选题】
The president will ( ) the memory of this visit to China.
①
motion
②
replace
③
cherish
④
upset
【单选题】
The secretary and principal ___ at the meeting now.
①
are speaking
②
is speaking
③
were making a speech
④
have a speech
【单选题】
What are not good rules to follow for making instructions effective?
①
Use simple instructions and make them suit the comprehension level of the students
②
Use the mother tongue only when it is necessary
③
Use body language to assist understanding
④
Not model the task or activity before letting students move into groups or pairs .
【单选题】
The suggestion they all objected to __________ very effective finally.
①
proved
②
prove
③
proving
④
to prove
随机题目
【单选题】
设连续型随机变量X的分布函数为F(x)=A+Barctan x，则常数A和B分别为（ ）
①
1/2, 1/π
②
1/4, 1/2
③
1/2, 1/4
④
1/π, 1/π
【单选题】
设二维随机变量(X,Y)只取下列数组中的值：（0，0）（-1，1）（-1，1/3）（2，0）且相应概率依次为1/6，1/3，1/12，5/12，则E(X+Y)=（ ）
①
7/9
②
3/7
③
5/6
④
10/9
【单选题】
设连续型随机变量X的分布函数为F(x)=A+Barctan x，则常数A和B分别为（ ）
①
1/2, 1/π
②
1/4, 1/2
③
1/2, 1/4
④
1/π, 1/π
【单选题】
设二维随机变量（X，Y）的分布律为<img src=https://huaweicloudobs.ahjxjy.cn/D5F8A330116E2722ED7C918300344FC5.png style=vertical-align: middle;/>则P{Y=1}=（ ）
①
0.3
②
0.4
③
0.7
④
0.8