题目内容
1.John's car is not here.I think he_______ somewhere.( )| A. | goes | B. | went | C. | has gone | D. | will go |
分析 约翰的车不在这里,我想他可能去了某地.
解答 答案:C.
现在完成时的构成是:主语+have/has+动词的过去分词,表示过去发生的动作对现在造成的影响或结果或表示过去的动作或状态持续到现在.have/has gone (to)意思是"去了某地(还没回来)"根据"John's car is not here"约翰的车不在这里,因此可知他可能出去了,故选C.
点评 首先要掌握现在完成时的构成以及用法,然后结合具体的题目,就可以确定正确答案.
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2.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.
61.Your teacher will probably tell you the rules aboveA the first lab lesson.
A.before B.since C.during D.after
62.Before every experiment,you shouldC.
A.taste the chemicals first
B.clean al the apparatus
C.read all instructions carefully
D.report al the accidents to the teacher
63.When you are not sure how to use all apparatus,C.
A.try them on your own
B.read the rules carefully
C.ask your teacher for help
D.put them back
64.It is clear that you canD.
A.bring food into the lab
B.enter the lab anytime
C.smell chemicals as you like
D.learn science directly in the lab
65.If you get chemicals on the clothing,you can find ways to solve it in the partB.
A.Before the Experiment
B.First Aid
C.During the Experiment
D.After the Experiment.
| LABORATORYRULES | |
| Throughout the lesson | •Do not enter the science lab without the teacher's permission.No food or drinks are to be allowed in the science lab. |
| Before the Experiment | •Read all instructions carefully before every experiment. •Prepare all apparatus(仪器)and arrange them so that you will 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 smell or taste chemicals unless your teacher gives permission. |
| After the Experiment | •Wash all apparatus after use and return them to the places where they were. •Throw waste materials in proper waste baskets. |
| First Aid | •Report all accidents to your teacher immediately. •If you spill( 溅 出 )any chemicals onto your body or clothing,wash with plenty of water and report to your teacher. |
A.before B.since C.during D.after
62.Before every experiment,you shouldC.
A.taste the chemicals first
B.clean al the apparatus
C.read all instructions carefully
D.report al the accidents to the teacher
63.When you are not sure how to use all apparatus,C.
A.try them on your own
B.read the rules carefully
C.ask your teacher for help
D.put them back
64.It is clear that you canD.
A.bring food into the lab
B.enter the lab anytime
C.smell chemicals as you like
D.learn science directly in the lab
65.If you get chemicals on the clothing,you can find ways to solve it in the partB.
A.Before the Experiment
B.First Aid
C.During the Experiment
D.After the Experiment.