He doubted ______ it was true. A: A.if B: B.that C: C.as though D: D.as if

Foolish ______ she is, she will not make the same mistakes twice. A: if B: with C: C．of D: D．as

Their products are known not only for their low price, ______ for their high quality. A: A.but B: B.but also C: C.and also D: D.as well as

Nylon fibers last longer and are stronger than natural fibers _______ silk or cotton. A: A.such as B: B.as regards C: C.as well as D: D.as such

Staying in a hotel for a day costs ________ renting in the country for a week． A: A.more twice than B: B.twice as much as C: C.as much as twice D: D.as much twice as

Watch out for injuries while exercising. Always stop ___________ you begin to feel any pain. A: A．in order that B: B．even if C: C．ever since D: D．as soon as

We may find that learning a foreign language does not have to be ______learning our mother tongue, but can in fact be as easy. A: A.twice harder as B: B.as twice hard as C: C.twice as hard as D: D.as twice hard

<img> Task 1 Complete each statement by choosing the appropriate answer from the four choices marked A, B, C and D.As her private secretary he has to all her letters. A: accent B: account C: access D: accident

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);