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26.The time is drawing near     food raised in space will directly benefit humans below.

     A.where            B.when             C.whether          D.why

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25.On snowy days, you have to drive very     to avoid traffic accidents.

     A.cautiously         B.neatly            C.smoothly         D.properly

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24.    alone in the large house, the little boy had to learn to survive by himself.

     A.To leave          B.Leaving           C.Left              D.Being left

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23.Play, often seen as     activity for kids, is still important in     development of teenagers.

     A.the; the           B.an; the           C.an; 不填         D.the; 不填

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22.A big step     to strengthen China’s health care systems since we launched an effort in 2008.

     A.has been taken                         B.is being taken

     C.was taken                             D.had been taken

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第一节:单项填空(共15小题,每小题1分,满分15分)

从A、B、C、D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。

21.---Let me help you cross the street.

   ---      ! I’m not that old.

     A.Take your time                         B.No way

     C.Come on                               D.Go ahead

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48.(生物技术实践8分)果酒的制作离不开酵母菌。请回答下列问题:

  (1)在实际酿酒过程中,一般先让酵母菌在        条件下进行繁殖,然后充分发酵,再通过        的方法获得果酒。

  (2)人工培养酵母菌,首先需要获得纯净的酵母菌菌种。

基本程序:①配制培养基→②接种→③培养→④观察记录→⑤纯化培养。

①配制培养基时,原料称量溶解之后,要进行     ,然后分装包扎并灭菌,常用的灭菌方法是      

②平板划线是常用的接种方法,划线之前要对接种环进行灭菌,原因是              

  (3)将酵母细胞固定化之后,与传统的发酵相比具有哪些优点?请列举两条。

                           

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