填空题

The author joined his friend and rushed to the hospital at once.

【参考答案】

N
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Silence Is Not Always Gold1. Many people cherish tile motto that silence is gold .2. However, nowadays if you always keep silence you will lose many chances to succeed.3. Silence, therefore, is no longer always gold.
单项选择题
The final goal of designing a lens is______.
A．to trap the opponent's lenses
B．to focus light with lenses
C．to hand-make lenses at low cost
D．to reflect light by means of curved surfaces
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