A. 15m
B. 20m
C. 30m
[单选题]6. —What are __________?-.—They are pencils.A.thisB.thatC.itD.these
[单选题]6. Chinese is different __________ English.A.fromB.inC.atD.on
[单选题]6. They are going to help tourists _________ speak French.A. can't whoB. who can-tC. don-t who .D. who do