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.
[单选题]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.
What did the author’s own research find about social media?A. It influences empl
[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
[问答题]What did your friend write about in her letter?
[主观题]What did (or do) you enjoy most about your last (or present) job?对与你的前一份（或现在的）工作，你最喜欢它的哪些方面？
[试题]InthisageofInternetchat,videogamesandrealitytelevision,thereisnoshortageofmindlessactivitiestokeepachildoccupied.Yet,despitethecompetition,my8-year-olddaughterRebeccawantstospendherleisuretimewritingshortstories.Shewantstoenteroneofherstoriesintoawrit
Find out as much as you can about him and _ back to me.A. exportB. reportC. impo
What accounts for the high drop-out rates for online students?A. There is no str
What did the two students emphasize to the group after reaching the mountain top