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【简答题】
Fill in the blanks with used to (do) or be used to (doing) . 1. This time, although she _____________ (not, receive) presents, she accepted his offer gratefully. 2. I _____________ (think) that tea was bad for you. 3. He seems _____________ (live) in hot countries. 4. There _____________ (be) a cinema in the town but now there isn't. 5. Hans has lived in England for over a year so he _____________ (drive) on the left now. 6. I _____________ (live) on my own. I've done it for quite a long time.
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举一反三
【简答题】已知在等差数列{ }中， ＝3，前7项和 ＝28。 （I）求数列{ }的公差d; （II）若数列{ }为等比数列，且 ， 求数列 }的前n项和 .
【单选题】妊娠期妇女相比于非妊娠期妇女，血浆容积增加约为（ ），红细胞数量增加约为（ ），出现了血液稀释。
A.
30%～40%，10%～15%
B.
40%～45%．15%～20%
C.
50%～60%，20%～25%
D.
60%～70%，25%～30%
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