问题 单项选择题

液体制剂特点的正确表述是( )。

A.不能用于皮肤、黏膜和人体腔道

B.药物分散度大,吸收快,药效发挥迅速

C.液体制剂药物分散度大,不易引起化学降解

D.液体制剂给药途径广泛,易于分剂量,但不适用于婴幼儿和老年人

E.某些固体制剂制成液体制剂后,生物利用度降低

答案

参考答案:B

解析:[试题解析] 本题考查要点是“液体制剂的特点”。在液体制剂中,药物以分子或微粒状态分散在介质中,分散度大,吸收快,能较迅速发挥药效。液体制剂的给药途径广泛,可以内服,服用方便,易于分剂量,特别适用于婴幼儿和老年患者;也可以外用,如用于皮肤、黏膜和人体腔道等。其能减少某些药物的刺激性。有些固体药物口服后由于局部浓度过高而引起胃肠道刺激作用,制成液体制剂通过调整制剂浓度而减少刺激性;某些固体药物制成液体制剂后,有利于提高药物的生物利用度。但液体制剂药物分散度大,又受分散介质的影响,易引起药物的化学降解,使药效降低甚至失效。液体制剂体积较大,携带、运输、贮存都不方便。水性液体制剂容易霉变,需加人防腐剂。非均匀性液体制剂,药物的分散度大,分散粒子具有很大的比表面积,易产生一系列的物理稳定性问题。因此,本题的正确答案为B。

阅读理解

阅读理解。

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

places

     Visit art museums. They offer a variety of activities to excite your kids' interest. Many offer workshops

for making land-made pieces, traveling exhibits, book signings by children's favorite writer, and even

musical performances and other arts.

     ·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.

     ·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.

1. If a child is interested in the universe, he probably will visit        

A. a Youtheater

B. an art museum

C. a natural history museum

D. a hands-on science museum

2. What can kids do at a Youtheater? 

A. Look at rock collections.

B. See dinosaur models.

C. Watch puppet making.

D. Give performances.

3. What does "hands-on science" mean in the last paragraph?

A. Science games designed by kids.

B. Learning science by doing things.

C. A show of kids' science work.

D. Reading science books.

4. Where does this text probably come from?

A. A science textbook.

B. A tourist map.

C. A museum guide.

D. A news report.

单项选择题