11.   One obstacle to finding an effective medicine is that so many different bugs cause colds.

v. + cold >>共 128
have 15.96%
catch 13.54%
get 5.57%
fight 5.57%
feel 3.53%
ice 2.78%
brave 2.23%
stop 2.23%
nurse 2.04%
cause 2.04%
cause + n. >>共 821
damage 8.58%
problem 6.70%
injury 3.26%
death 2.52%
explosion 2.10%
casualty 2.06%
delay 1.77%
accident 1.75%
crash 1.64%
concern 1.57%
cold 0.04%
每页显示:    共 11