问题
This is 3-Dprinter. And this is an artificial (人工的) ear. Canyou believe that scientists printed this artificial ear by this 3-D printer
A: a
B:an
C:the
D: /
B:an
C:the
D: /
正确答案是：
同类题型
Our friendship _____ quickly over the weeks that followed
are you sure your aunt ___ back from America—Yes My mother ___ me I am going to see her now
_____ you like ______ football — Yes, of course.
Do you have________trouble dealing with the problem?—YesIt is________me
Please read every sentence carefully. youare, mistakes you’ll make.—Thank you for your advice.