单项选择题

A．Send Mary a gift.
B．Give the woman Mary’s address.
C．Send a thank-you card to Mary.
D．Mail Mary a card of sympathy.
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问答题
S2. In creating a lens a lens designer attempts to trap light by forcing all the rays arising from a single point in the subject to focus on a single point in the image, as a consequence of their passing through a series of transparent (透明的) elements with precisely curved surfaces.
填空题
将necessarily改为unnecessarily。
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