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【单选题】
一般保存病毒毒种的最佳温度是A.
37℃
B.
4℃
C.
-20℃
D.
-70℃
E.
室温
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反馈参考答案：
举一反三
【单选题】My friend John called and ____me to his party just now.
A.
will invite
B.
invited
C.
invites
D.
has invited
【单选题】— Has John arrived? —Yes, already. ________ he wait outside or just come in?
A.
Shall
B.
May
C.
Could
D.
Must
【简答题】总线上连接的各类设备,按其对总线有无控制功能可以分为________ 的___________。
【单选题】John has just passed his driving test, so now he's on the ______ for a cheap car.
A.
pursuit
B.
track
C.
discovery
D.
trace
【单选题】听力原文：W: Hello. May I speak to John? M: Sorry, he has just gone to America for a meeting. Where is John now?
A.
America.
B.
China.
C.
Canada.
【单选题】I don't think John saw me. He ____ a book at that moment. [ ]
A.
just read
B.
has just read
C.
was just reading
D.
had just read
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