A.Use one hand to carry the microscope |
B.Place a sample directly on the clean stage |
C.When stored, the microscope should be adjusted. |
D.Look through the eyepiece with one eye. |
A.Switch to objective lens. | B.Adjust the mirror. |
C.Look through the eyepiece. | D.Place the hair on a glass slide. |
A.a(chǎn)fter correctly adjusting the mirror |
B.while looking at the specimen on a glass slide |
C.a(chǎn)fter slowly raising the objective lens |
D.before positioning the mirror correctly |
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A.do more harm than good | B.a(chǎn)re easy to get rid of |
C.a(chǎn)re almost the same | D.might help find crimes |
A.the scientific test used by police |
B.a(chǎn) new kind of fingerprint |
C.a(chǎn) kind of bacteria'in people's hands |
D.a(chǎn) kind of newly invented keyboard |
A.They found the criminal among the 237 people. |
B.They could tell who had used which computer. |
C.Computer keyboards couldn't keep people's microbe fingerprints. |
D.People's characters could be identified by the keyboards they used. |
A.your microbes may give you away |
B.scientists will come to a clear conclusion soon |
C.many scientists think microbe fingerprints useless |
D.the microbe fingerprint has been used in many cases |
A.the importance of fingerprints | B.how to clean our hands |
C.the usefulness of microbes | D.different germs on our hands |
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B.Plants use color to attract attention |
C.Antioxidants can protect plants from UV light |
D.Antioxidants help free radicals to attack plants |
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C.c,a,d,b | D.d,b,a,c |
A.our bodies’ defences are not natural |
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A.a(chǎn) conclusion of the research |
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C.a(chǎn) statement of the experiment |
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A.Bold losing fish become—e bolder when presented With a novel food item. |
B.Losing their fights causes the bold fish to be much more courageous. |
C.Bold fish watching a shy fish exploring a mystery get less nervous. |
D.Shy fish losing fights grow more confident in exploring new food. |
A.Fish have stress in the fierce fights. |
B.Fish care about winning or losing a fight. |
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D.Fish can learn a lot by watching others. |
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