硬固体是一种（）
A.无弹性的固位体
B.有弹性的固位体
C.有弹性的非固位体
D.有弹性的连接体
E.弹性很佳的固位体
参考答案：A
------It’s too noisy here. I can’t stand it.
------Me, too. We have to ____________ new ways to solve the problem.
A．come up with
B．keep up with
C．catch up with
D．help out with
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