⑴____A. He B. you C. I
⑵____A. blue B. fine C. yellow
⑶____A. he B. she C. his
⑷____A. wear B. red C. do
⑹____A. green B. white C. red
如图是一把折扇,∠O=120°,AB交CD∧于点E,F,已知AE=20,EF=4,则扇面(阴影部分)的面积为____ .
观察右边漫画《价格战》,回答下列问题。
John is now working as an interpreter because he________an unusual ability to learn languages quickly.
函数处的切线方程是