学习语法首先要学习句子，因为句子是人类语言的核心，通过对句子的分析理解，可以更好的掌握语法。下面是小编整理的英语四级语法模拟练习(21)，希望对你的语法学习有所帮助！
201.This watch is _______ by hand, not by machine, so it is very expensive.
A.flat B.coined C.bored D.manufactured
202.These two horses look so much alike that we can not _______ one from the other.
A.differ B.detail C.distinguish D.defeat
203.The president of that company was very calm during the political _______.
A.failure B.fashion C.proceed D.crisis
204._______ is usually the chief enemy of the camera lens.
A. Occasion B.vain C.Moisture D.Deck
205.The _______ left the ship after sixty hours of hard struggle.
A.dash B.cell C.crew D.gay
206.On our way to Beijing, we visited Xi'an, a city of two million _______, and stayed there for two days.
A. insects B.human C.inhabitants D.flights
207.One of the main reasons for air pollution is that many cars _______ smoke into the atmosphere.
A.gather B.hire C.discharge D.escape
208.Don't forget to _______ to let us know you arrived safely.
A.cable B.cage C.border D.bay
209.She gave him a _______ that she could not come to his party.
A.mistress B.shoot C.neck D.hint
210.When the temperature is below zero, water will _______.
A.freeze B.virtue C.sink D.seek
201.D
202.C
203.D
204.C
205.C
206.C
207.C
208.A
209.D
210.A
