室性早搏的心电图特点是（） A.QRS>0.12s B.提前出现的QRS波群之前有逆

He was so busy that he couldn’t help ____________ the experiment.

A．doing

B．do

C．did

D．done

Directions: Read the following three passages. Each passage is followed by several questions or unfinished statements. For each of them there are 4 choices marked A,B,C and D. Choose the one that fits best according to the information given in the passage.

Zoo Lights

6pm---10pm Thursdays through Wednesdays, through Jan. 7. The Phoenix Zoo’s 15^th-annual holiday light festival features more than 2 million lights and light displays throughout the zoo, as well as a new arctic exhibit and jingo, the talking giraffe. Phoenix Zoo, 455 N. Galvin Parkway, $7 ahead of time. Phoenix. $8 at gate. (602)273-1341. www.phoenixzoo.org.

Cowboy Christmas

5pm---9pm Thursdays, 5pm---10pm Fridays and Saturdays, 5pm---9pm Sundays through Wednesdays, through Jan 1. Rawhide’s Main Street will be lit with 150,000 lights, including a 100-foot tall “tree of lights” and nightly lighting ceremony. Rawhide at Wild Horse Pass, 5700 W. North Loop Road, Gila River Reservation. FREE. (480) 502—5600. www.rawhide.com.

Arizona Celebration of Lights

6pm---9pm Thursdays, 6pm---l0pm Fridays and Saturdays, 6pm---10pm Sundays through Wednesdays, through Jan.1. A 2-mile drive featuring 300 light displays with more than 5 million lights. Community Church of Joy, 21000 N. 75th Ave., Glendale. $12 per car, $8 for adults, free for kids aged 4 and younger, $2 discount with canned food or toy donations. (623)561—0500. www.joyonline.org.

Glendale Glitters Quiet Nights

6pm---10pm Thursdays through Wednesdays, through Jan.6. A display featuring 1.4 million lights decorates downtown Glendale. It also features an animated musical light show in the north part of town. The center of the display is at Murphy Park. Murphy Park, 5850 W. Glendale Ave. Glendale. FREE. (623)930—2820.

Valley of Lights

6pm---12pm Thursdays through Wednesdays, through Dec. 30. A one-mile drive through exhibits featuring more than 100,000 lights and animated displays. Donations accepted. Fain Park, 2200 N. Fifth St., Prescott Valley. FREE. 1一(928)一759—3090. www.pvchamber.org.

小题1:These ads are all about__________.

A．night light displays in the Phoenix Zoo

B．celebrations of lights

C．Christmas activities all over the world

D．advertisements of some products小题2:Which of the following websites can offer you further information about the 100-foot tall “tree of lights”?

A．www. pvchamber. org.

B．www. joyonline. org.

C．www. rawhide.com.

D．www. phoenixzoo.org.小题3:If Mr. Smith and Mrs. Smith drive to Arizona Celebration of Lights with their son aged 5, most probably how much will they pay for the visit at least?

A．$34.

B．$36.

C．$28.

D．$26.小题4:According to the text, which of the following offer animated displays?

A．Zoo Lights & Cowboy Christmas.

B．Valley of Lights & Cowboy Christmas.

C．Zoo Lights & Arizona Celebration of Lights.

D．Valley of Lights & Glendale Glitters Quiet Nights.小题5:What’s the purpose of the text?

A．To attract more visitors to these activities.

B．To collect more donations from the visitors.

C．To let kids have an interesting Christmas Day.

D．To earn more money.

大理石平板在使用时注意事项（）。

A.测量时可在平板上磨擦工件以去除毛刺

B.可在平台上敲打

C.可用水进行平台清洁

D.使用前要擦干净平台表面，禁止磨擦、敲击，使用后最好用平台腊保养

Cl₂与NH₃能生成猛烈爆炸性化合物并产生氯化铵白烟，此法可用于检验Cl₂的（）

A、浓度

B、温度

C、压力

D、泄漏

下列哪种治疗对此病人是错误的

A．及时使用胰岛素
B．积极补液、纠正脱水
C．积极补碱，尽快一次纠正酸中毒
D．积极治疗肺部感染
E．严密观察血钾，防止低血钾