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【单选题】
To avoid loss of antifreeze due to expansion, the cooling system .A.
must not be completely filled
B.
must install a pressure control valve
C.
must install a bypass valve
D.
must be sealed
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举一反三
【简答题】从方框内选择恰当的句子，补全对话。 W: Hi, Li Qiang. M: Hi, Lucy. W: It's December 23. Christmas Day (圣诞节) is coming, do you know? M: Yes, the day after tomorrow. _______ (1) W: _______ (2) M: There are three important...
【单选题】-M: Merry Christmas! -W: ________
A.
Oh, thanks to you!
B.
Happy New Year!
C.
The same to you!
D.
I never celebrate it!
【多选题】适合用于液相色谱 - 质谱联用仪离子源
A.
大气压化学电离源（ APCI ）
B.
基质辅助激光解吸离子源（ MALDI ）
C.
电子轰击电离源（ EI ）
D.
电喷雾电离源（ ESI ）
【单选题】From the passage we can infer that
A.
electronic mail will soon play a dominant role in transmitting messages.
B.
it will become mere difficult for people to keep secrets in an information era.
C.
people will spend less time holding meetings or conferences.
D.
events will be reported on the spot mainly through satellites.
【单选题】听力原文：W: Harry, the Christmas is coming soon. Let's go shopping for some presents. M: Oh, God. Leave me alone. What do we learn from the dialogue?
A.
Christmas is coming soon.
B.
Harry is not going to do Christmas shopping.
C.
The two speakers are doing Christmas shopping.
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