随着网络信息量的急剧增加，网络速度会越来越慢。（）

阅读理解，回答问题。

     Mrs. Green is going to give Mary a birthday party. Mary is her daughter. She will be ten years old.

A lot of her friends are coming to the party. Twenty of them are girls.

     Mrs.Green is getting ready for the party. Mrs.White is helping her.

     "That's a big nice cake," says Mrs.White to Mrs.Green.

     "Thank you very much."

     Mrs.Green is going shopping now.She is going to buy fruit for the party.Mrs.Green buys a lot of

pears, apples, oranges and bananas. Then she goes home.

     It's five o'clock in the afternoon. Everything is ready. Now the first girl is arriving. The party is going

to begin in thirty minutes.

1. Who is Mrs.Green going to give a birthday party to?

    _______________________________.

2. How old is Mary now?

   _______________________________.

3. What does Mrs.Green buy fruit for?

   _______________________________.

4. When is the party going to begin?

   _______________________________.

5. How many girls are there at the party?

   _______________________________.

关于细胞结构和光合作用说法错误的一项是（　　）

A．植物之所以能进行光合作用是因为它的细胞结构里含有叶绿体

B．动物和植物细胞中都有线粒体，能进行呼吸作用来为生命活动提供能量

C．植物细胞既有细胞膜又有细胞壁，它们都能控制物质的进出

D．光合作用的实质是制造有机物，储存能量

关于牛顿第二定律，下列说法中正确的是[ ]

A．牛顿第二定律的表达式F=ma在任何情况下都适用

B．某一瞬时的加速度，只能由这一瞬时的外力决定，而与这一瞬时之前或之后的外力无关

C．在公式F=ma中，若F为合力，则a等于作用在该物体上的每一个分力产生的加速度的矢量和

D．物体的运动方向一定与物体所受的合外力的方向一致

氟19被α粒子轰击，产生一个新核和一个质子， 写出核反应方程．

前段开模慢速主要是为了（）。

A.避免拉裂塑件表面

B.缩短成型周期

C.提高生产效率

D.使机器运动更平稳