Scientists have found no ________of life on Mars so far,though great efforts have made on the research.
#7179
A
symbols
B
signs
C
marks
D
signals
推荐题目
We should make a careful study of his____.
#7357
A
useful teaching experiences
B
useful teaching experience
C
usefully teaching experiences
D
usefully teaching experience
Sir, you are not allowed to enter the building unless you get our manager’s__.
#6250
A
permission
B
connection
C
instruction
D
introduction
To make members of a team perform better, the trainer first of all has to know their _____ and weaknesses.
#7464
A
strengths
B
benefits
C
techniques
D
values
Gerneally speaking, it is difficult to breathe at a high of Tibet (西藏).
#6385
A
altitude
B
attitude
C
length
D
width