大功率离心泵常不装底阀、不灌泵，而采用（）抽吸气体以消除气缚现象，然后启动泵。A.往

阅读理解。

     Jackie Heinricher's love with bamboo started in her backyard. "As a child, I remember playing among the

golden bamboo my dad had planted, and when it was windy, the bamboos sounded musical. It was my

favorite place."

     A biologist (生物学家) by training, Heinricher, 47, planned to work in a company in Seattle, where she

lived with her husband, but she found it too boring. Her garden gave her the idea for a business. She would

plant bamboo on their private farm. 

     Heinricher started Boo-shoot Garden in 1998. She realized early on what is just now beginning to appear

on the rest of the world. Bamboo is useful as well as earth-friendly. It can be used to make skate-boards,

buildings, fumiture, floors and even clothing. Bamboo takes in four times as much carbon dioxide (CO₂) as

hardwood trees and gives out 35% more oxygen (O₂).

     First she had to find a way to produce a lot of the plants.   It was a hard task since bamboo flowers create

seed (种子) only once every 50 to 100 years. And dividing a

bamboo plant too often kills it."People kept telling us we'd never succeed," says Heinricher. " Others had

worked on it for 27 years! I believed in what we were doing, though, so I just kept going."

     After a nine-year experiments, she found a way to grow millions of plants. The number of workers in her

company increased from 5 to 55. Now she is working on all kinds of bamboo and selling them all over the

world.   

     "We are at the wonderful moment," she says. "It takes me a lot of time to decide where to pay my

attention. Producing bamboo products? Selling plants to gardeners? Educating farmers about the economic

(经济的) and environmental value of bamboo forests? Or asking the govemment to line roads with bamboo?"

1. When did Heinricher begin to love bamboo?

A. When she was a child.

B. When she was

C. Twenty-seven years ago.

D. About ten years ago.

2. Bamboo is earth-friendly because _______.

A. it can produce musical sounds

B. it can be used widely

C. it can make our city beautiful

D. it can help clean the air

3. What does the passage mainly talk about?

A. Heinricher's bamboo garden.

B. Heinricher's bamboo company.

C. Heinrieher's bamboo story.

D. Heinricher's bamboo products.

4. What is Heinricher's work like now?

A. It's still in great trouble.

B. It has been successful.

C. It's in perfect condition.

D. It has begun to go easily.

为适应和满足消费者的购买心理所采用的定价策略是( )。

A．整数定价

B．现金折扣

C．季节折扣

D．渗透定价

在社交活动中，与人交谈时应注意避免哪些失礼于人的情况？

关于定金合同的陈述，正确的是( )。

A．定金合同为诺成性合同
B．定金合同不要求采取书面形式，只需交付即可
C．定金数额最高不得超过主合同标的额的25%
D．收受定金的一方不履行约定的债务的，应当双倍返还定金