Q2: The word “build” refers to the shape and size of a person’s body when it is used for describing people’s appearance. ________ (T/F)
What difficulties did the slaves have in travelling the Underground Railroad to freedom?
“Smart clothes” has the same meaning with “casual clothes”. (T/F)
The active voice is used to describe the action. The passive voice is mainly used to describe the state or the result of the action. (T/F)
Past perfect continuous tense is used to indicate an action that happened continuously in the past before something else occurred. (T/F)
In 1860, the United States had _______ of railroad track. By _______, almost _______ as much track had been laid.
No one could use or afford computers when Apple produced the first machine. (T/F)
The terms “also”, “too”, “either” and “while” are often applied to indicate similarities. ________ (T/F)
设f（t)为因果信号，已知 f（t)*f&39;（t)=（1-t)e-tε（t) 求f（t)。
The Pygmalion effect refers to the phenomenon in which the greater the expectation placed upon people, the worse they perform. T F None None
若f（t)的奈奎斯特角频率为ωn，则f（t)+f（t一tn)的奈奎斯特角频率为__________，f（t)COS（ω0。t)的奈奎
设f（t)=0,t＜3,对信号f（1-t)f（2-t)确定其值一定为零的t值区间。
"Underground Railroad" here refers to______.
In cities across the United States, old factories, warehouses, schools railroad stations and other buildings are being renovated for new uses.City planners and private investors are finding the good buildings, no matter how old, can be remodeled for new purposes.“If you’d asked someone four or five years ago whether he’d rent an apartment in an abandoned piano factory of clothing warehouse, he’d have thought you were crazy,” says a New York architect.“Today, many people are eager to do it.” The renovating may include a former city hall or courthouse changed into offices; a bank or church changed into a restaurant; or , as in Plains, Georgia, a railroad station used as a center for a presidential campaign.
Developing railroads, shipping, and other______interests, the US based United Fruit Company was known as the "Octopus" among resentful Central Americans.
No nation leaped into the 20th century like Japan. For two hundred years, Japan remained and isolated from the rest of the world. It doubted of western ways. In 1854, Commodore Perry of the U. S. Navy sailed into Tokyo Bay. When he showed the people inventions like the telegraph and railroad train, Japan realized what it was missing. Japan has quickly caught up with western technology. It may have even gone past it.
The committee for local development asked that the new highway______along-side the railroad.
In two decades after introduced into the U. S., railroads didnt become the chief means of transportation mainly because people were______.
若f（t)=证明f（t)=f（1/t).
证明f（t)δ"（t)=f（0)δ"（t)-2f&39;（0)δ&39;（t)+f"（0)δ（t)。
已知文法G[E]：E→T|E+T|E-T ，T→F|T*F|T/F ，F→（E）|i该文法的开始符号是（）。
若F<sub>1</sub>（ᵚ)=F[f<sub>1</sub>（t)]，F<sub>2</sub>（ᵚ)=F[f<sub>2</sub>（t)]，证明 。
A fast railroad train,traveling 96 kilometers an hour,takes more than 48 hours to cross the country.
对于一系统的输入输出关系为y（t）=f（3-t）-f（t-1），f（t）为输入，y（t）为输出，试问：该系统是__（）
