债务人履行债务后，定金应当抵作价款或者收回。给付定金的一方不履行约定的债务的，无权要

Do you often like to use disposable（一次性的） chopsticks when eating out? It’s time to drop this habit.

China products（生产） 80 billion pairs of disposable chopsticks every year. “This is enough to cover Tian’anmen Sqaure 363 times,” said Bai Guangxin, chairman of Jilin Forest Industry Group, at the National People’s Congress on March 8.

The government has made some rules to limit（限制）the use of disposable chopsticks. However, there are still many being produced.

“The production of such chopsticks is a heavy burden on national forests,” Bai added. A total of 20 million 20-year-old trees would have to be cut down to make way for this annual production.

Bai called on people to bring their own chopsticks whenever they are eating out. “We first need to bring a change to people’s eating habits and encourage everyone to carry their own chopsticks around.” He also said that there may be technology that can turn wild grass into disposable chopsticks in the future.

小题1:Are there still many disposable chopsticks being produced ?

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小题2:How many pairs of disposable chopsticks does China product every year?

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小题3:What can turn into disposable chopsticks in the future?

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起动机的作用是将蓄电池的电能转化为（），驱动发动机。起动机由（）、（）、（）三部分组成。

经济新常态下，我国产业结构更趋优化，经济由工业主导迈向（）。国家统计局数据显示，2015年一季度全国第三产业增加值占国内生产总值的51.6%，比上年同期提高18个百分点，高于第二产业8.7个百分点。

A.农业主导

B.文化产业主导

C.贸易业主导

D.服务业主导

（）是新古典主义和浪漫主义之间的过渡人物。

构成细菌侵袭力的物质基础有哪些？其作用是什么？