题目内容

The last and most difficult lesson____ (be) Lesson 14.

A. are
B. done
C. is
D. were

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I, who .____ your friend, will try my best to help you.

A. are
B. is
C. was
D. am

The scientist and engineer ____ (have) invented a new machine.

A. are
B. was
C. has
D. were

Alice, together with her friends____ (be) punished for having broken the school rules.

A. were
B. was
C. am
D. is

相对于等材制造工艺与减材制造工艺等其他制造工艺，3D打印具有许多的优势，其中不包括

A. 可以使用任何材质进行打印，且成本低廉。
B. 突破了传统加工制造方法对复杂形状加工的限制，使人类在加工领域实现了自由。
C. 可以实现个性化定制。
D. 在特殊领域的广泛运用，例如医疗领域。