A.before | B.since | C.during | D.a(chǎn)fter |
A.taste the chemicals first |
B.clean al the apparatus |
C.read al instructions carefuly |
D.report al the accidents to the teacher |
A.bring food into the lab | |
B.enter the lab anytime | |
C.smel chemicals as you like | D.learn science directly in the lab |
A.Before the Experiment |
B.First Aid |
C.During the Experiment |
D.After the Experiment |
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A.Three | B.Four | C.Five | D.Six |
A.E-books can’t be red on mobile phones. |
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小題1: |
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小題2: |
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小題3: |
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小題4: |
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小題5: |
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小題6: |
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小題7: |
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