已知△ABC的高为AD，∠BAD=70°，∠CAD=20°，则∠BAC的度数是（ ）。
90°或50°
else in the world could the companies have got a better workforce than in China.
A．Somewhere
B．Anywhere
C．Everywhere
D．Nowhere
A．+→
B．→+
C．+→
D．→+
+
→
→
+
+
→
→
+
