有关组织的信号强度，下列哪项正确（） A.T1越短，信号越强；T2越短，信号越强 B

用一个放大5倍的放大镜看一个10°的角，这个角的度数变成了50°．______（判断对错）

Look! _______ some juice in the glass.

A．There is

B．There are

C．There have

D．There has

Is that the man ______ helped us a lot after the earthquake? [ ]

A. whose

B. which

C. when

D. who

降级

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