Yancheng is the only city____ China to be named after salt．（ ）
A．atB．onC．inD．with
The twins look exactly the same．______ of them are in my class．（ ）
A．EachB．BothC．EitherD．None
I don't think students should use mobile phones at school．
______．They really have a bad influence on our study．（ ）
A．I agree with youB．Not at all
C．No problemD．It's my pleasure
Many scientists believe that robots ______ able to talk like humans in 50years．（ ）
A．wereB．areC．will beD．have been
Why does the earth look blue in space？
Because most of the earth's surface ______ by water．（ ）
A．coversB．is covered
C．coverD．are covered
Look! The model is walking to us．______ nice dress!（ ）
A．WhatB．What aC．HowD．How a