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The biggest library in the world is in America. It is the Library of Congress in Washington D.C.
The library is a wonderful place for reading and studying. Every day many people go there to ask for help for their studies. They can borrow books from the library. They can also read quietly in the library all day.
Also, hundreds of people ask questions and get answers over the phone. Through the internet, the library can help more and more people around the world.
1．The Library of Congress is in America.2．You can’t talk and eat in the library.
3．Many people go to the biggest library to buy the books.
4．Hundreds of people ask and answer questions over the phone.
5．The biggest library in the world is wonderful.
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
