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【单选题】
具有致畸作用的环境污染物是A.
烷基汞
B.
苯
C.
一氧化碳
D.
E.
亚硝酸盐
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反馈参考答案：
举一反三
【单选题】If the call is not for you, what should you NOT do?
A.
Set the phone down while you get the person.
B.
Ask the person politely to wait while you get the person asked for.
C.
Cover the receiver and shout for the other person at the top of your lungs.
D.
None of the three.
【简答题】到目前为止，我国哪个海区赤潮发生最为频繁？
【单选题】What can you do if the international line is engaged?
A.
Ask the operator to call you back later.
B.
Make a 'person-to-person' call.
C.
Call back outside office hours.
D.
Wait and call again when the line is free.
【单选题】What are you advised to do when you get a wrong number in making a long distance call?
A.
Check your number and call again.
B.
Tell the operator what has happened.
C.
Ask the operator to put you through.
D.
Ask the operator what has happened.
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