听觉信号的音响长声为3s，短声为（）A、1sB、1.5sC、2sD、2.5s

     以下图片呈现的是Mr. King一家生活中不安全用电现象，下面有五条针对其中五种不安全用电现

象的建议，请你将每一种现的编号(A，B…F)填人相应建议前面的括号内。

( )1. Please don't put the fish bowl on the TV set.                              

( )2. Would you mind moving the baby away? He is going to play with the outlet.  

( )3. You should not put anything on a lamp.                                     

( )4. Could you please take the wire away? Don't let the dog play with the outlet.

( )5. Will you please not use the heater in a wet bathroom?                      

在撒哈拉以南的非洲分布最广的气候是（　　）

A．热带沙漠气候

B．热带雨林气候

C．热带草原气候

D．地中海气候

锚喷时允许使用巷道中污水。

You are ordering ship’s stores. Which statement is TRUE?（）

A.Stores such as line，rags，mattresses，linens，etc. must be treated to be fire retardant

B.Stores certified for use on uninspected vessels may be identified by the certification number used by Underwriter's Laboratories

C.A portable container of a flammable liquid used as fuel for portable auxiliary equipment must be stowed in a paint locker or at a designated open location

D.Acetylene may be in a ship's storeroom in quantities not exceeding 6000 cubic feet