下列说法中，正确的个数为（  ）

（1） $\overrightarrow{AB}+\overrightarrow{MB}+\overrightarrow{BC}+\overrightarrow{OM}+\overrightarrow{CO}=\overrightarrow{AB}$

（2）已知向量 $\overrightarrow{a}$ =（6，2）与 $\overrightarrow{b}$ =（﹣3，k）的夹角是钝角，则k的取值范围是k＜0

（3）若向量 $\overrightarrow{e_1}=\left(2,-3\right),\overrightarrow{e_2}=\left(\frac{1}{2},-\frac{3}{4}\right)$ 能作为平面内所有向量的一组基底

（4）若 $\overrightarrow{a}\parallel \overrightarrow{b}$ ，则 $\overrightarrow{a}$ 在 $\overrightarrow{b}$ 上的投影为 $\left|\overrightarrow{a}\right|$ ．

    Are you looking for some new and exciting places to take your kids to? Try some of these  places:

    Head to a natural history museum. This is where kids can discover the past from Dinosaur (恐龙) models to rock collections and pictures of stars in the sky. Also, ask what kind of workshops and educational programs are prepared for kids and any special events that are coming up.

    Go to a Youtheater. Look for one in your area offering plays for child and family visitors. Pre-show play shops are conducted by area artists and educators where kids can discover the secret about performing arts. Puppet (木偶) making and stage make-up are just a couple of the special offerings you might find.

    Visit art museums. They offer all kinds of activities to excite your kids' interest. Many offer workshops for making hand-made pieces, traveling exhibits, book signings( 签名) by children's favorite writers, and even musical performances and other arts.

    Try hands-on science. Visit one of the many hands-on science museums around the country. These science play-lands are great fun for kids and grown-ups alike. They'll keep your child mentally and physically active the whole day through while pushing buttons, experimenting, and building. When everyone is tired, enjoy a fun family science show, commonly found in these museums.

(    )一I like the red dress．I like that white one too．

一You can try    on．