【简答题】Write down a suitable word in meaning with the letter given. 1. very good— 2. not dirty— 3. at once— 4. be afraid of — 5. fewer than many but more than two—
【简答题】As shown in the Fig.2. Given △ABC with BC=4 and circle A with radius 2. BC is tangent to circle A at D. The circle A intersects with AB and AC at point E and F, respectively ∠EDF=140°. Then the area o...