28. Don't leave Mary by_________. She is only one year old.
A. her B. she C. herself
27. Would you please pass me_________ sugar on the table?
A. a B. the C. /
26. I'm afraid there_________much time left. Let's hurry.
A. isn't B. aren't C. is
(1)如果折痕FG分別與AD、AB交與點(diǎn)F、G(如圖1),,求DE的長(zhǎng);
(2)如果折痕FG分別與CD、AB交與點(diǎn)F、G(如圖2),△AED的外接圓與直線BC相切,
求折痕FG的長(zhǎng).
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