某同学利用如图1所示电路来测量电阻的阻值。将电阻箱接入A.、b之间，闭合开关。适

用所给动词的正确形式完成短文，并将正确答案依次填在短文后相应的横线上。

    Mike was very excited today. His father and his brother, Joe, would take part in Safety Day at his school.

They had a very important lesson 1             (share).

    When the headmaster told the students that Joe and his father 2             ( give ) them a talk about bike

safety, some of them 3             ( laugh ), because they rode a bike every day. There was nothing to know

about bikes. When they saw Joe's father 4             ( push ) Joe in a wheelchair, however, they changed their

minds.

    Joe told his story. The car hit him very close to home. In fact, at that time he 5              ( come ) out of

his way on a very quiet street, but he didn't stop 6             ( look ). He didn't see the car drive along the

block (街区). He 7             ( hit ) right then and there. He couldn't stand any more. He 8              ( be ) in a

wheelchair for two years. Some students asked some questions about his feelings in a wheelchair. He

answered them honestly.

    They also talked about the fun of 9              ( ride ) a bike. It is healthy. It is not necessary to stop riding,

but the most important thing is to be careful and 10              ( obey ) some safety rules.

美味快餐厅平均每天售出盒饭805份，那么一星期售出多少份？

请你写出一个含有字母a的代数式，使字母a不论取什么值，这个代数式的值总是正数，你所写的代数式是（    ）。

二尖瓣脱垂综合征患者出现室性早搏和阵发性室速时，首选（）

A.维拉帕米

B.艾司洛尔

C.利多卡因

D.硫酸镁

E.普罗帕酮

菠萝除了杂交育种用干籽繁殖外，还用（）方式繁殖？

A、冠芽

B、裔芽

C、吸芽

D、茎部

E、组织培养繁殖