The number of air crashes that ____ in developing countries ____ increasing. [ ]

A. happens; is

B. happen; is

C. happens; are

D. happen; are

使用如下数据表：
仓库表(仓库号，所在城市)
职工表(职工号，仓库号，工资)
其中，仓库号、所在城市和职工号字段为字符型，工资字段为数值型。

有如下SQL SELECT语句：
SELECT * FROM 职工表 WHERE 工资 ＜=2000 AND 工资＞=1500
下列与该语句等价的是

A. SELECT * FROM 职工表 WHERE 工资 BETWEEN 1500 AND 2000
B. SELECT * FROM 职工表 WHERE 工资 BETWEEN 2000 AND 1500
C. SELECT * FROM 职工表 WHERE 工资 FROM 1500 INTO 2000
D. SELECT * FROM 职工表 WHERE 工资 FROM 2000 INTO 1500