31. It’s not easy for experts to ______ H1N1 flu in humans from regular human seasonal influenza.
A.distinguish | B.separate | C.define | D.recognize |
According to the arrangement, the athletes of our school ________ at the gym for two hours every day.
A.work out | B.carry out |
C.take in | D.set aside |
Our government's plan to fight against air pollution will focus on ________ information and handling PM2.5.
A.expressing | B.representing |
C.gathering | D.acknowledging |
In fact fuels we burn and plant food we eat ________ their chemical energy in the form of heat.
A.give in | B.give off |
C.give away | D.give up |
Don't be so discouraged.If you ________ such feelings, you will do better next time.
A.carry on | B.get back |
C.break down | D.put away |
Schools in China are required to ________ at least one “Sports Day” per academic year.
A.set aside | B.set down |
C.set out | D.set off |