Scientists study ____ human brains work to make computers.
#5936
A
when
B
how
C
that
D
whether
推荐题目
Englishmen usually don’t ask each other about ___ affairs.
#6215
A
public
B
political
C
school
D
private
You may demand an immediate _____ if the company fails to supply the product in time.
#5179
A
refund
B
justice
C
guarantee
D
cooperation
One thousand dollars a month is not a fortune but would help cover my living _______.
#7506
A
bills
B
expenses
C
prices
D
charges
Dark clouds are a ___of rain while a smile a ____of friendship.
#7583
A
sign; gesture
B
gesture; sign
C
sight; method
D
make; way