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　　Laboratory work is your chance to learn science firsthand．It can be fun but you must be careful to prevent injury．Listen closely when your teacher reads and explains the rules before your first lab lesson．

　　LABORATORYRULES

　　Throughout the lesson

　　·Do not enter the science lab without the teacher’s permission．·No food or drinks are to be alowed in the science lab．

　　Before the Experiment

　　·Read al instructions carefuly before every experiment．

　　·Prepare al apparatus(儀器)and arrange them so that you wil not knock them over while doing the experiment．

　　During the Experiment

　　·If you are unsure of how to use any apparatus or how to operate, ask your teacher for help．·Never smel or taste chemicals unless your teacher gives permission．

　　After the Experiment

　　·Wash al apparatus after use and return them to the places where they were．

　　·Throw waste materials in proper waste baskets．First Aid

　　·Report al accidents to your teacher immediately．

　　·If you spil(濺 出)any chemicals onto your body or clothing, wash with plenty of water and report to your teacher．

(1)

Your teacher wil probably tel you the rules above _________ the first lab lesson．

[　　]

A．

before

B．

since

C．

during

D．

after

(2)

Before every experiment, you should _________．

[　　]

A．

taste the chemicals first

B．

clean al the apparatus

C．

read al instructions carefuly

D．

report al the accidents to the teacher

(3)

When you are not sure how to use al apparatus, _________．

[　　]

A．

try them on your own

B．

read the rules carefuly

C．

ask your teacher for help

D．

put them back

(4)

It is clear that you can _________．

[　　]

A．

bring food into the lab

B．

enter the lab anytime

C．

smel chemicals as you like

D．

learn science directly in the lab

(5)

If you get chemicals on the clothing, you can find ways to solve it in the part _________．

[　　]

A．

Before the Experiment

B．

First Aid

C．

During the Experiment

D．

After the Experiment

答案：1．A;2．C;3．C;4．D;5．B;
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　　One way that scientists learn about man is by studying animals．In this lab, the scientists are studying the relationship(關(guān)系)between diet(飲食)and health．They are studying the relationship between the amount(數(shù)量)of food the mice(老鼠)eat and their health．The mice are in three groups．All three groups are receiving the same healthy food．The first group is eating one cup of food each day, the second group is eating two cups, and the third group is eating three cups．

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[　　]

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a different

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[　　]

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Man and health

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eating less may bring longer life

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[　　]

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[　　]

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[　　]

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[　　]

A．No other
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