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
S1. You do not remain at this deep fourth stage all night long, but instead about 80 minutes after you fall into slumber, your brain activity level will increase again slightly.
填空题
将necessarily改为unnecessarily。
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