如图，在图1中，互不重叠的三角形共有4个，在图2中，互不重叠的三角形共有7个，在图3中，互不重叠的三角形共有10个，…，则在第n个图形中，互不重叠的三角形共有个____（用含n的代数式表示）．

如图是夏季晴朗的一天中，某绿色植物体内C₃和C₅两种化合物相对含量的变化曲线图，有人据图做出了如下分析和判断，其中正确的是（　　）

已知x、y的取值如下表所示：

x	0	1	3	4
y	2.2	4.3	4.8	6.7

若从散点图分析，y与x线性相关，且 $\widehat{y}$ =0.95x+ $\widehat{a}$ ，则 $\widehat{a}$ 的值等于（   ）

阅读下面短文，从各题所给的A、B、C、D四个选项中选出最佳选项。
B
Join Us for a Day at Sun Valley Amus ement Park

    Children aged 10 to 14 are invited to take part in the "Event of the Summer" at
Sun Valley Amusement Park, the most popular amusement park on the East Coast.
Sun Valley has more than 80 amusement rides. For sports lovers, there are
basketball courts, an indoor baseball field and climbing walls.
    No amusement park would be complete without a gift shop. Sun Valley
has two.
    You won't want to miss out on this day of fun. Join us at Sun Valley Amusement Park on July 14. Register (登记) early.
    • The cost of the trip is $ 25. This includes tickets and all rides.
    • We suggest that all children bring lunch.
    • Buses leave at 9.00 AM and return at 5.00 PM.
    • Rain Date: Wednesday, July 16.
    Register at the Children's Recreation Center at the Town Hall by July 3.
    A one-day registration will also be held on July 1 at the Brown School.
    For more information, call Jane Parks at 555-7267.

综合题