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附加题： 甲骑自行车从A地到B地，自行车从B地到A地，两人都匀速前进．第一次相遇在距A地18千米处．相遇后两人继续前进，各自到达目的后立即按原路返回出发地，第二次相遇在距A地36千米处．求A、B两地间的距离．
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举一反三
【单选题】The owners got their phones back for another week.Then the researchers ___returned____
A.
collected
B.
answered
C.
returned
D.
used
【单选题】亚急性重型肝炎（亚急性肝坏死），哪一个说法是错误的？（）
A.
急性黄疽型肝炎起病10d以上
B.
出现三高（高度乏力、高度腹涨、高度食欲不振）表现
C.
出现三突出（黄疸、腹水、出血倾向突出）症状者
D.
肝性脑病在此型中多出现于疾病的早期
E.
病程较长，可达数月，容易发展为坏死后肝硬化
【单选题】The researchers wished to compare the six soil samples collected during experiments 1 and 2 according to permeability (ability of water to pass through them). A portion of each sample was placed in a ...
A.
one minute is sufficient time for some amount of water to escape at least some of the cups.
B.
the same amount of soil was added to all six cups.
C.
in each cup, the proportions of sand, silt, and clay were the same as in the original sample.
D.
the filters did not allow soil particles to escape through the bottoms of the cups.
【简答题】请列举图像输出的方法。
【简答题】The researchers then injected the targeted drug-dendrimer complexes intravenously into mice riddled with human epithelial-cell cancer.
【简答题】The researchers then applied meta-ysis——a technique developed by Glass——to the data from all the studies in an attempt to determine overall the relative effectiveness od different methods.
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