下列说法不正确的是( )
A.棉花、羊毛、尼龙都属于天然纤维
B.磷肥可以增强作物的抗旱、抗寒能力
C.点燃氢气前一定要检验其纯度
D.人们正在利用和开发的其他能源有风能、地热能、太阳能、潮汐能等
﹣Do you know ______?﹣Two months ago.( )
when did he take this photo
when he took this photo
where did he take this photo
where he took this photo
﹣﹣Hi,Nancy.What is your brother doing?
﹣﹣He ______ a shower.( )
is taking
was taking
took
take
The telephone ______ by Bell in 1876.( )
will be invented
is invented
was inventing
was invented
﹣﹣Tell him ______ tomorrow,please.
﹣﹣OK.( )
come
to come
comes
coming
Robots ______ more heavy work for us in the future.( )
did
will do
have done
were doing