煤矿“一炮三检”指在装药前、放炮前和放炮后要检查( )。
A．瓦斯浓度
B．放炮器
C．泡泥
D．雷管
参考答案：A
Jack wanted to read more, so he asked his friends if there was ________ to read. [ ]
A. something easy enough
B. something enough easy
C. enough easy something
D. easy enough something
主要用于预防Ⅰ型变态反应所致哮喘的药物是（）
A.氨茶碱
B.肾上腺素
C.特布他林
D.色甘酸钠
E.异丙肾上腺素
