What did the scientists do to find out if the e-nose worked?

A． They presented it with all common crops..

B． They fixed 13 sensors inside the device.

C． They collected different damaged leaves.

D． They made tests on damaged and healthy leaves.

[单选题]What did the students find out about McKay?A． He trained pilots for some time.B． He lived longer than other pilots.C． He died in the Second World War.D． He was downed by the pilot Boelcke.

[问答题]What did I say to cause you to do that?.

[单选题]H．ow did the host find out there was a thief in the house?A． He heard someone breathing.B． He heard footsteps in the hall.C． He noticed a shadow on the floor.D． He noticed that his gifts were gone.

[单选题]What did scientists learn about earthquakes at the Rocky Mountain Arsenal?A．) They occur at about 4,000 metres below ground level.B．) The injection of water into earthquake faults prevents earthquakes from occurring.C．) They are usually caused by the

[单选题]What will scientists do to make sure the poison works this time?A． They will try some of it themselves.B． They will use a special kind of poison.C． They will drain the lake first.D． They will only put the poison in the wells.

[单选题]What did the host do to the thief?A． He cursed him very loudly.B． He gave him food and money.C． He drove him out of the house.D． He called the police immediately.

[单选题]Tom, what did you do with my documents? I have never seen such a _____ and

[单选题]I have been for years troubling the pages of historians, to find out what o

[主观题]Q： What do you find frustrating in a work situation？(在工作中，什么事令你不高兴？)

[单选题]What did duret do shortly after the ambulance came? ( )A． He was interviewed by a newspaperB． He asked his girlfriend for his dry clothesC． He went to the hospital in the ambulanceD． He disappeared from the spot quickly