已知：x＜-1，化简：|3x+1|-|1-3x|

股票配售对象不包括经批准募集的证券投资基金。（）

若直线ax+2y+1=0与直线x+y-2=0互相垂直，则a=______．

阅读理解。

Jack is a clerk of a bookstore. Here is the note from his boss, Ben. Jack has to decide what books to order according to the following note and the descriptions of the books. Hi Jack,     You must hand in the order list of books to me by the first working day of every month. The rules for choosing books are:      For textbooks:    ● August is coming. We must choose all textbooks, without thinking of other rules.         For books which are not textbooks:     ● If more than five copies of books were sold last month, we choose them. But if there are five copies or more in stock (现货), we do not make an order.     ● If the wholesale (批发) prices of the books are higher than $75, we do not choose them. And we do not order anything whose retail (零售) price is higher than $100. Ben The descriptions of the books Title: Homeland English Publisher (出版社): Homeland Ltd Wholesale price: $110 Retail price: $140 Textbook: Yes Copies sold last month: 3 Copies in stock: 2 Title: How to Become Successful Publisher: Founders Company Ltd Wholesale price: $25 Retail price: $40 Textbook: No Copies sold last month: 2 Copies in stock: 1 Title: Biology at a Glance Publisher: New Times Publishing Ltd Wholesale price: $70 Retail price: $95 Textbook: No Copies sold last month: 18 Copies in stock: 3 Title: Good Health in 20 Days Publisher: Oscar World Ltd Wholesale price: $50 Retail price: $66 Textbook: No Copies sold last month: 10 Copies in stock: 20

1. Jack must hand in the order list to his boss by ______.

[ ]

A. the first day of last August B. the last working day of this month C. the last day of next August D. the first working day of each month

2. If Jack wants to buy the books about success, he should order them from ______.

[ ]

A. Homeland Ltd B. Founders Company Ltd C. Oscar World Ltd D. New Times Publishing Ltd

3. The wholesale price of the book ______ is over $100.

[ ]

A. Homeland English B. Good Health in 20 Days C. Biology at a Glance D. How to Become Successful

4. The number of the books sold best last month is ______.

[ ]

A. 3 B. 10 C. 18 D. 20

5. Jack can't buy Good Health in 20 Days because ______.

[ ]

A. it is not a school textbook B. its wholesale price is too high C. the copies in stock are more than 5 D. the copies sold last month are over 5

仔细阅读“世界大洲大洋分布图”和“四幅气温曲线图”，并完成下列问题。（每空1分，共6分）

①         ②      ③     ④

（1）大洲Ａ与大洲Ｂ的分界线是             ，它是世界最大大洋Ｃ和          洋的最近水上通道，在这两个大洲生活的土著居民印第安人属于          人种。

（2）当Ｄ点出现极昼现象时，图中Ｅ点和Ｆ点气温更低的是          。

（3）根据世界降水分布规律，赤道穿过的地区降水量        。（多或少）

（4）大洲Ｇ所在地区是地球上最冷的地区，它的气温年变化情况与气温曲线图中的       图基本相吻合。

为了保证研究结果能够回答研究目的中提出的问题，首要工作是（）

A.病例队列研究

B.资料分析

C.资料整理

D.科研设计

E.结果的表达