No one has yet succeeded in explaining the ___ of how life began.
#6736
A
cause
B
problem
C
reason
D
puzzle
推荐题目
Several leading _____ resigned from the party yesterday.
#5861
A
figures
B
numbers
C
images
D
memberships
On New Year’s Day, people, especially girls, always wear new____-new hats, new coats, new trousers and new shoes.
#6673
A
clothes
B
clothing
C
cloth
D
cloths
Drive straight ahead, and then you will see a to the Hefei - Nanjing Expressway.
#6285
A
sign
B
mark
C
signal
D
board
Mary was given a huge pay rise as a for her great efforts in improving sales.
#6386
A
reward
B
result
C
price
D
title
Health problems are closely connected with bad eating habits and a _______ of exercise.
#6844
A
limit
B
lack
C
need
D
demand