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【判断题】
A company had sales and cost of goods sold of $350,000 and $200,000, respectively. Its gross profit equals $150,000.A.
正确
B.
错误
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举一反三
【多选题】not... until, get everything ready, he, for the experiment, leave, the lab, Xiao Wang
A.
It was not until he got everything ready for the experiment that Xiao Wang left the lab.
B.
It was not until he got everything ready for the experiment which Xiao Wang left the lab.
C.
It was not until he got everything ready for the experiment when Xiao Wang left the lab.
D.
It was Xiao Wang who did not leave the lab until he got everything ready for the experiment.
【单选题】听力原文：W: Can we leave the lab now, teacher? M: No, you must tidy the lab before you leave. When can the student leave?
A.
The student can't leave unless he has put everything back in the cupboard.
B.
The student can leave after he turns off the electricity.
C.
The student can leave after he has tidied the lab.
【单选题】Before you leave the lab, the doors and windows ____shut in case of rain.
A.
is
B.
are
C.
is to be
D.
are to be
【单选题】What will the students probably do after the talk?
A.
Leave the room.
B.
Hand in their lab notebooks.
C.
Go to Professor Kaplan's office.
D.
Work on an experiment.
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