离心泵工作时，充满叶轮的液体受（）作用，向叶轮的四周被高速甩出，高速流动的液体汇集在

下列各数：3，0，-5，0.48，-（-7），-|-8|，（-4）²中，负数有（　　）

A．1个

B．2个

C．3个

D．4个

阅读理解。

     There is a new park near Andy's home. It's fine today. Andy and his family are in the park now. On their

left, there is a cafe. On their right, there is a big lake. There are many flowers and trees around the lake.

There's a small hill behind the lake. Near the lake, there are two signs. One says, "Don't swim in the lake!"

The other says, "No fishing!" But you can go boating on the lake. There is a beautiful garden in the middle

of the park. There is green grass and beautiful flowers in it. There are some small shops between the lake

and the garden. The park is so nice. Andy and his family like it very much.

1. The park near Andy's home is ______. [ ]

A. new and beautiful

B. old and beautiful

C. clean and new

D. old and clean

2. Is there a cafe in the park? ______.

A. Yes, there isn't.

B. No, there isn't.

C. Yes, there is.

D. No, there is.

3. People can ______ on the lake. [ ]

A. swim

B. fish

C. boat

D. play

4. The shops in the park are not ______. [ ]

A. small

B. big

C. good

D. pretty

5. Do Andy and his family like the park? ______. [ ]

A. Yes, they don't.

B. No, they do.

C. Yes, very much.

D. No, they don't.

English is a language that many people around the world ____ not speak perfectly but ____ at least understand.

A．may; can

B．would; might

C．will; must

D．could; might

细菌性肺炎的抗菌治疗包括（）。

A.经验性治疗和抗病原体治疗

B.一般性治疗

C.广谱抗菌治疗

D.特殊性治疗

E.强力抗菌治疗

使用某种医疗器械可能或者已经引起严重健康危害的，应对该医疗器械进行（）

A.一级召回

B.二级召回

C.三级召回

D.四级召回