Question 20-30Before the mid-nineteenth century,people in the United States ate most foods only in season.Drying,smoking,and salting could preserve me...
语法 (Page 174)1.Some snakes lay eggs,but others _____ birth to live offspring.(A)give(B)giving(C)they give(D)to have given2.Because it was so closely r...
Question 20-28Under certain circumstance the human body must cope with gases at greater-than-normal atmospheric pressure.For example,gas pressures inc...
30.According to the passage,the invention of the visible-light microscope allowed scientists to (A)see viruses directly(B)develop the electron microsc...
语法1.Portland,Maine,is _____ the poet Henry Wadsworth Longfellow spent his early years.(A)where(B)it where(C)where is(D)which is where2.As consumers...
13.Scientists believe the first inhabitants of the Americas arrived by crossing the land bridge that connected Siberia and _____ more than 10,000years...
阅读Question 1-7Hotels were among the earliest facilities that bound the United States together.They were both creatures and creators of communities,as ...
11.All of the following are given as characteristics of collectible objects EXCEPT(A)durability(B)portability(C)value(D)scarcity.12.According to the p...
Question 32-38If you look closely at some of the early copies of the Declaration of Independence,beyond the flourished signature of John Hancock and t...
40.What does the second paragraph mainly discuss?(A)The Milky Way(B)Major categories of galaxies(C)How elliptical galaxies are formed(D)Differences be...