题目

隐藏在表层后面、内部、下面的结构为不可见结构，一般采用虚线表达这类结构，但在机械加工图中更多地采用（ ）来表示不可见的结构，同时把虚线变成实线。 A . 主视图 B . 剖视图 C . 左视图 D . 俯视图 答案：BMy friends and I had just finished lunch at a hotel when it started to rain heavily. When it became lighter, I decided to get my   , which was parked at my office three streets away.My friends that I shouldn’t go, mainly because I was seven months pregnant(怀孕) then. I promised them that I’d be very   . One of them wanted to come with me but I asked her to stay with another friend who needed help her baby.I walked out of the hotel and started making my way to the car. At the crossing, a van stopped and a man came out with an umbrella. Before I knew what was happening, he walked right  me and told me he’d escort(护送)me. Although I refused, he said that he would.　　During our walk, he kept telling me to walk slower, as the ground was   . When we got to the car park, I thanked him and he went away. I did not get his name and can   recognize(认出) him now. Did he stop for me? I’ll never know.　　So how did I pay it forward? I was at home when I noticed two Indian workers   in the heavy rain. They were probably on their way to the working place near my home. I went out and passed them my   . I told them they should take and keep it. They were surprised by my action. They were very grateful to me, probably   why a stranger was offering such kindness. I was so relaxed and happy that day.1.A. moneyB. bagC. carD. raincoat2.A. arguedB. receivedC. calmedD. disliked3.A. braveB. carefulC. proudD. helpful4.A. forB. aboutC. withD. on5.A. throughB. pastC. belowD. beside6.A. wetB. dryC. toughD. crowded7.A. oftenB. evenC. hardlyD. nearly8.A. fightingB. playingC. workingD. walking9.A. umbrellaB. coatC. loveD. kindness10.A. trainedB. wonderedC. talkedD. refused