题目内容：

Over the past 10 years, developments in technology have moved the dream of personal fling vehicles closer to reality. The British company Malloy Aeronautics has developed a model of its flying bicycle. The company says its Hoverbike will be a truly personal flying vehicle.

The company’s marketing sales director Grant Stapleton says the Hoverbike is able to get in and out of small spaces very quickly and can be moved across continents very quickly because it can be folded and packed.

Safety was the company’s main concern when developing the Hoverbike. The designers solved this problem by using overlapping rotors(重叠旋翼) to power the vehicle. With adducted rotors(内转旋翼) the rider immediately not only protects people and belongings if he were to hit them, but if the rider ever were to crash into somebody or something, it’s going to bring the flying vehicle out of the air. The company is testing two models of the Hoverbike.

In New Zealand, the Martin Aircraft Company is also testing a full-size model of its personal flying device, called Jetpack. It can fly for more than 30 minutes, up to 1,000 meters high and reach a speed of 74 kilometers per hour.

Peter Coker, one officer from the company said Jetpack “is built around safety from the start.” In his words, “Reliability(可靠性) is the most important part of it. We have safety built into the actual structure itself, very similar to a Formula One racing car.”

Jetpack uses a petrol-powered engine. It also has a parachute(降落伞) that can be used if there should be an emergency(突发事件). It opens at very low altitude(纬度) and actually saves both the flying vehicle and the pilot in an emergency.

Mr. Coker says Jetpack will be ready for sale to the public by the end of 2019. He adds it’ll have a price of about $200,000.

1.According to the text, the Hoverbike         .

A. is ready for sale    B. is difficult to control

C. is easy to carry    D. is popular in England

2.What is Paragraph 3 mainly about?

A. How the Hoverbike flies.    B. How models of the Hoverbike were tested.

C. How the Hoverbike was powered.    D. How the designers solved the Hoverbike’s problem of safety.

3.The underlined word “It” in the sixth paragraph refers to         .

A. the petrol-powered engine    B. the parachute

C. the vehicle    D. the overlapping rotor

4.Peter Coker attaches great importance to Jetpack’s         .

A. safety    B. speed

C. market    D. power