影响丁二烯收率主要有（）等原因。A.BBR中丁二烯含量 B.第二精馏塔釜液中丁二烯含

I don’t understand how you got a ticket. I always ________ you ________ a careful driver.

A．think; are

B．am thinking; are

C．thought; were

D．think; were

阅读理解。

     The Los Angeles Zoo has many public programs that aim to teach the public about animals and natural

protection.

Safari shuttle (旅游电车)

     While you're here, take the Safari shuttle for a quick trip from one end of the Zoo to the other. All day

long, seven days a week (from 10 am to 5 pm), the Safari Shuttle picks up passengers, circles the Zoo, and

returns to the main flamingo (火烈鸟) exhibit near the front entrance. You can get on and off the shuttle as

often as you like.

Food

     Safari Café (at the Zoo entrance) offers Starbucks coffee, fresh-baked cookies, and ice cream. Gorilla

Grill is the spot for toasted food, kids' meals, snacks, and ice cream. La Casita serves a variety of Mexican

food and refreshments (甜点). Silverback's Cafe offers sandwiches, salads, bread bowls, cold beer, and

refreshments.

Hour

     The Zoo is open from 10 am to 5 pm every day of the year except Christmas Day. Special summer long

hours are until 6 pm. from July 1 to September 7. Please remember, the Zoo starts putting animals in for the

night at 4 pm during regular hours, and at 5 pm. during summer hours. Admission Prices (票价)

     Adults (aged 13 and above): $ 9

     Seniors (aged 62 and above): $ 6

     Children (aged 2 to 12): $ 4

     Children (under 2): free

Items Not Allowed on Zoo Grounds

     Alcohol, Glass bottles, Pets, Bicycles, Skateboards, and In-line skate.

     If you are planning a picnic while visiting the Zoo, please do not bring any glass items or other things that

are easy to break. Also for the safety of the animals, no plastic bags are allowed within the Zoo.

1. Which of the following provides kids' meals? [ ]

A. Safari Café.

B. Gorilla Grill.

C. La Casita.

D. Silverback's Café.

2. People can see all the animals at the Los Angeles Zoo at ______. [ ]

A. 11 am. on Christmas Day

B. 4:30 pm. on May 5

C. 3 pm. on March 5

D. 6 pm. on September 7

3. How much does it cost if a couple with their one-year-old twins visits the Los Angeles Zoo? [ ]

A. $18.

B. $26.

C. $22.

D. $17.

4. When visiting the Los Angeles Zoo, people can ______. [ ]

A. ride a bike through the Zoo

B. have a picnic on the Zoo grounds

C. take food with plastic bags

D. take their pets along

构筑社会保险基金的安全网？

( )是指由确定性变量构成的时间数列，其特点是影响数列各期数值的因素是确定的，且各期的数值总是保持在一定的水平上下波动。

A．随机性时间数列

B．平稳性时间数列

C．趋势性时间数列

D．季节性时间数列

由于钍钨棒会产生放射性，因此，钍钨棒应存放在铅盒内。（）