题目

Though ________ to see us, the professor gave us a warm welcome. A．surprising                           B．was surprised C．surprised                            D．being surprised 答案：解析：考查省略。前半句是“Though he was surprised to see us”的省略形式。一般情况下，如果状语从句的主语与主句的主语相同，并且从句的谓语含有be动词，通常省略状语从句中的主语和be动词。 答案：C已知||=，||=2，.=-3，则与的夹角是（ ）A．150°B．120°C．60°D．30°