问题 多项选择题

当遇到下列情况时,正确的做法是( )。

A.发现煤气中毒后,要打开门窗,通风;松解上衣,转移病人

B.遇到地震时,一定要保持冷静。若在高楼内,俯身躲在坚固的家具旁或狭小空间,背向窗户,并用书包等物品保护头部

C.陷入沼泽地时用一根长竹竿插入泥潭,用力往上爬

D.在森林中一旦遭遇火灾,使用沾湿的毛巾遮住口鼻,伺机逆风突破林火包围

答案

参考答案:A,B,D

解析: 陷入沼泽地后,不要挣扎,应采取平卧姿势,尽量扩大身体与泥潭的接触面积,减少压强,慢慢游动到安全地带而脱险。C项使用竹竿往上爬,由于受力面积减少,压强变大,只会使人越陷越深。C项做法错误。故选ABD。

完形填空

Of all living creatures on earth, insects are the most plentiful. Some  36  are very useful to man, for example, bees,  37  we get honey and wax, and silkworms, which  38  us with silk. Other varieties, 39 , are extremely harmful, and do a great  40  of damage, especially to crops. Locusts (蝗虫) are perhaps the most dangerous of all,  41  they will eat almost any green  42  , and when millions of them  43  on cultivated land(耕地)they soon leave it  44 . In some countries they are the farmer’s  45  enemy. Another nuisance is the common  46  , not only because it  47  us indoors and out - of- doors, but because it spreads diseases.

  Scientists have given much time and  48  to the study of insects. It needs the most careful and  49  observation. Thanks  50  their discoveries we now know almost all 51 is to be known about the habits of these hardworking insects, bees and ants, which live in 52 better planned in some ways than our  53  . But the most valuable work has been done in trying to give  54  to men, animals and crops from the  55  which insects cause.

  36.A. members  B. forms  C. qualities  D. varieties

  37.A. by which  B. from which  C. of which  D. in which

  38.A. give  B. produce  C. offer  D. supply

  39.A. however  B. meanwhile C. therefore  D. what's more

  40.A. majority  B. number  C. amount  D. quantity

  41.A. and  B. for  C. if  D. when

  42.A. grass  B. field  C. fruit  D. plant

  43.A. settle  B. attack  C. pass  D. cross

  44.A. bare  B. nothing  C. empty  D. untouched

  45.A. hardest  B. greatest  C. serious  D. wildest

  46.A. insect  B. creature  C. fly  D. enemy

  47.A. dislikes  B. bites  C. worries  D. hates

  48.A. understanding  B. ideas  C. comprehension  D. thought

  49.A. serious  B. patient  C. curious  D. long

  50.A. for  B. of  C. to  D. with

  51.A. that  B. which  C. there  D. what

  52.A. societies  B. crowds C. teams  D. organizations

  53.A. world  B. nation  C. selves  D. own

  54.A. help  B. protection  C. living  D. defense

  55.A. injury  B. wound  C. sickness  D. ruin

问答题 简答题