DateTime用于表示C#的日期时间类型的数据。DateTime now1=DateTime.Now; now1表示当前的日期时间，如何求的90天以后的日期（ ） A: DateTime newday=now1+90; B: DateTime newday=now1.AddDays(90); C: DateTime newday=now1.AddMonths(3); D: DateTime newday=now1.AddYears(90);

1∠0°= 1∠90°= 1∠-90°= 1∠180°=

比较下列各数的大小：0，90，-1，6-1。（） A: 6-1＞0＞-1＞90 B: 90＞6-1＞0＞-1 C: 0＞-1＞6-1＞90 D: 0＞-1＞90＞6-1

∠1与∠2互为余角，那么∠1的补角是（）. A: 180°＋∠1 B: 90°＋∠1 C: 90°＋∠2 D: 90°－∠2

对于正棱柱型管式折叠纸盒的自锁底结构，下列陈述中正确的是（）。 A: γ1＞90，γ2＜90，ρ＝α/2 B: γ1＜90，γ2＞90，ρ＝α/2 C: γ1＝γ2＝90，ρ＝α D: γ1＝γ2＝90，ρ＝α/2

1. He is now working as the ______ of a popular weekend television talk-show. (Para. 1)

In the Dixon's case, they are now both (1)______________ and both (2)_________ the work of child caring.

Now Xiao Wang ______ Class 1 was running very fast. A: in B: of C: from

Now he is ___ artist. 1 have known him since he was ___ one-year-old boy.

对于正棱柱型管式折叠纸盒的自锁底结构，下列陈述中正确的是（）。 A: Aγ₁＞90，γ₂＜90，ρ＝α/2 B: Bγ₁＜90，γ₂＞90，ρ＝α/2 C: Cγ₁＝γ₂＝90，ρ＝α D: Dγ₁＝γ₂＝90，ρ＝α/2