[单项选择]Magnesium (has little) structural strength and must be (alloyed) with another metals (such as) aluminum and zinc when it is (to be subjected) to stress.
A. has little
B. alloyed
C. such as
D. to be subjected

[单项选择]
A little airplane has given new meaning to the term "going hyper."
The Hyper-X recently broke the record for air-breathing jet planes when it traveled at a hypersonic speed of seven times the speed of sound. That’s about 5,000 miles per hour. At this speed, you’d get around the world -- flying along the equator -- in less than 5 hours.
The Hyper-X is an unmanned, experimental aircraft just 12 feet long. It achieves hypersonic speed using a special sort of engine known as a scramjet. It may sound like something from a comic book, but engineers have been experimenting with scramjets since the 1960s.
For an engine to burn fuel and produce energy, it needs oxygen. A jet engine, like those on passenger airplanes, gets oxygen from the air. A rocket engine typically goes faster but has to carry its own supply of oxygen. A scramjet engine goes as fast as a rocket, but it doesn’t have to carry its own oxygen
A. it was the first air-breathing jet plane
B. it flew along the equator
C. it flew at speeds smaller than five times the speed of sound
D. it traveled at a supersonic speed

[单项选择]This little girl has a particular liking for chocolate. Whenever she sees it, she will snatch a bar and enjoy it to her heart’s content（）
A. 这个小姑娘特别喜欢吃巧克力，无论什么时候见到巧克力，她都会抓起一块大口大口地吃起来。
B. 这个小姑娘喜欢吃巧克力，只要见到巧克力，她都会抓起一块心满意足地吃起来。
C. 这个小姑娘特别喜欢吃巧克力，无论什么时候见到巧克力，她都会抓起一块心满意足地吃起来。
D. 这个小姑娘喜欢吃巧克力的程度是，只要见到巧克力，她都会抢过来心满意足地吃起来。

[单项选择]What he has just said has little to do with the question ______ discussion.
A. on
B. under
C. in
D. at

[单项选择]The marketing manager has little confidence in talking the board of directors out of the plan about the launching of a new product.（）
A. 销售经理太缺乏信心，根本不可能说服董事会停止谈论推出新产品之事。
B. 销售经理在劝董事会放弃投放这项新产品的计划时，表现得毫无信心。
C. 营销部经理想劝董事会放弃投放这项新产品的计划，对此他有一点信心。
D. 营销部经理对劝说董事会放弃投放这项新产品的计划几乎没什么信心。