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【单选题】
下列常见物质中都含有碳元素，其中不属于（或其主要成分不属于）有机物的是 [ ]A.
葡萄糖
B.
碳酸钠
C.
大米粉
D.
鸡蛋清
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举一反三
【单选题】If you really have to leave during the meeting, you’d better leave _________ the back door.
A.
for
B.
by
C.
across
D.
out
【单选题】---- May we leave the classroom now? ---- No, you _____. You _____ to leave until the bell rings.
A.
mustn’t, are allowed
B.
can’t, aren’t supposed
C.
don’t have to, are supposed
D.
needn’t, aren’t allowed
【单选题】Do remember to __________the lights before you leave. If you leave them _______, the boss will be angry with you. [ ]
A.
turn on, on
B.
turn down, off
C.
turn off, off
D.
turn off, on
【单选题】— Can I leave this door open at night? — You _______ better not.
A.
should
B.
would
C.
could
D.
had
【单选题】--- May we leave the classroom now? --- No, you ____________ . You ____________ to leave before the bell rings.
A.
mustn’t, are allowed
B.
don’t have to, are allowed
C.
needn’t, aren’t allowed
D.
can’t, aren’t allowed
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