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（仪器）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（ 溅 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

　　Mr Smith had a week holidays, so he said, “I'm going to see the sea by train.” He put on his best clothes, took a small bag, went to the railway station and got into the train He had a beautiful hat, and he often put his head out of the window during the trip and looked at the beautiful scenery. But the wind pulled his hat off.

　　Mr Smith quickly took his old bag and threw it out of the window, too. The other people in the train laughed, “Is your bag going to bring back your beautiful hat?” they asked. “No,” Mr Smith answered, “but there is no name arid no address in my hat, and there's a name and an address on the bag. If someone finds both of them, he or she will send me the bag and hat.”

(1) Mr Smith went to have his holidays of ________.

[　　]

(2) Mr Smith put his head out of the window to ________.

[　　]

A．see the beautiful scenery

B．say goodbye to his friends

C．throw his hat out of the window

D．say hello to the people outside

(3) Mr Smith is going to ________ during his holidays.

[　　]

A．visit his friends

B．see his parents

C．enjoy himself in the train

D．see the sea

(4) Why did Mr Smith throw his old bag out of the window? Because ________.

[　　]

A．he hoped someone would find his bag

B．he hoped someone would send back his bag and hat.

C．he hoped his bag would bring back his hat

D．he hoped the people in the train would laugh

(5) From the passage we can see that Mr Smith was a ________.

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