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题型：单选题题类：模拟题难易度：普通

This is 3-D printer. And this is an artificial (人工的) ear. Can you believe that scientists printed this artificial ear by this 3-D printer?

A、a B、an C、the D、/

举一反三

- What do you want to be when you grow up?
-I want to be_______ social worker. Many people are in great need of our help.

Nanjing, the ancient capital of the six dynasties, is becoming ________ international city and attracts more and more foreign tourists every year.

-This is ____________ useful book, I think.

-So it is, and it's ____________ unusual one.

—You see, it's my dream to buy__________iPhone X.

—Oh, you can ask your parents to buy __________for you.

—What is Anna like?

—She is ________outgoing girl and she likes talking with others.

This is _____ interesting book and it is also______ useful one.

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