A、Attacking logical leap.
B、Attacking motion defining.
C、Attacking relevance.
D、Attacking impact.
A.The developing world is unwilling to take preventive action.
B.People think the developed world should take more responsibility.
C.People do not consider the preventive action an urgent task.
D.Harmful emissions are hard to reduce in the developing countries.
A、A Knoop hardness (HK)
B、B Vickers hardness (HV)
C、C Scleroscope (HSc) test
D、D Mohs hardness
Passage 1 Cars are lots of fun, but they could also be dangerous. We have to be careful when we drive them or ride in them. It's always a good idea to put on your seat belt when you're in a car. Why? Think about this example: You put an egg on a skateboard(滑板) and give it a push. If the skateboard hits a stone, it will stop, but the egg won't. It will fly through the air, hit the ground and break. Now, think what would happen if you tied the egg to the skateboard. When the skateboard hits a stone, the egg won't go flying. It will stay safely on the skateboard. Volvo, a famous Swedish carmaker, was the first to use seat belts in 1949. Air bags are also very important for car safety, because sometimes a seat belt isn't enough. If the car is going really fast and runs into something, seat belts could even hurt the people who wear them. Most newer cars have air bags in front of and next to the seats. When a car hits something, its air bags will come out quickly--in less than one second--to keep the people inside safe. 题目: 1. We have to be careful in driving a car mainly because it could be ______________ .
A、little fun
B、a pleasure
C、a lot of trouble
D、a great danger
为了保护您的账号安全,请在“简答题”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!