马克思说：“人的本质不是单个人所固有的抽象物，在其现实性上，它是一切社会关系的总和。

化学是一门以____为基础的科学。我们观察到石蜡是____色____体（状态），密度____（填“>”“<”或“=”）水的密度，用指甲在石蜡表面划过，会____，说明石蜡的硬度_____(填“硬”、“软”)。

短文改错

      At 7: 30 on the morning, we gathered at the school gate and set off on a large bus.An hour later,

we arrive at the Forest Park.Getting off, we started our journey at once.

     First, we climbed the green hills and on the way tried their luck to hunt for hidden treasure.Next,

we toured around the lake in the comfortable boat.The beautiful scenery was really a feast for the eye.

Then at noon time, we landed and settled at an open area, which we enjoyed a wonderful picnic.After

eating, we sang and danced happy and played some interesting games.The day passed quickly.Finally

it was time for us to return back.So at 3:00 pm, we cleaned the ground, made our way to the parking

lot, getting on the bus and left.

     It was really an exciting trip since we had long busy with our school work.

_______________________________________________________________________________

苹果的icloud存在安全策略漏洞，苹果公司采用方法进行弥补（）

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B.限定账户每天登录次数

C.一次验证

D.限定账户登录时间

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