9. A.By a gift card. B.By cheque. C.In cash. D.By credit card.

Much ______ my regret, I am unable to accept your kind invitation. A: to B: B．at C: C．with D: D．by

9. A.By a gift card.B.By cheque.C.In cash. D.By credit card. A: By a gift card. B: By cheque. C: In cash. D: By credit card.

What’s the airport like How will the man pay the ticket A: By cash. B: B．By credit card. C: By plastic money. D: D．By traveler’s check.

Most students study because it’s unavoidable. , there are students who actually enjoy it. A: A．As a result B: B．In addition C: C．In conclusion D: D．By contrast

______ at the airport, Mrs. Robertson felt a great burden taken off her shoulders. A: A.Seen her two sisters-in-law off B: B.Having seen her two sisters-in law off C: C.With her two sisters-in-law seen off D: D.By seeing her two sisters-in-law off

如果ξ与η不相关，则（）。 A: D（ξ+η）=Dξ+Dη B: D（ξ-η）=Dξ-Dη C: D（ξη）=Dξ·Dη D: E（ξη）=Dξ·Dη

已有定义intd=-2;，执行以下语句后的输出结果是：printf('*d(1)=%d*d(2)=%3d*d(3)=%-3d* ',d,d,d,d);printf('*d(4)=%o*d(5)=%7o*d(6)=%-7o* ',d,d,d,d);printf('*d(4)=%x*d(5)=%6x*d(6)=%-6x* ',d,d,d,d);

圆柱螺旋弹簧的旋绕比C是（） A: d/D B: d/D C: D/d D: D/d

已有定义int d= –2；执行以下语句后的输出结果是。 printf(" * d(1) =%d * d(2)= %3d * d(3) =% –3d * "，d，d，d)； printf(" * d(4) =%d * d(5)= %7d * d(6) =% –7d * "，d，d，d)；