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【单选题】
It can be inferred from the passage that______.A.
light waves could be used in a device similar to radar
B.
radar was a practical application of a well-known principle
C.
radar gready increased the effectiveness of the Royal Air Force
D.
sound waves are reflected from a hillside under all conditions
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举一反三
【单选题】I had neither a raincoat nor an umbrella ____I got wet through.
A.
It's the reason
B.
That's why
C.
There's why
D.
It's how
【单选题】怎样使一张照片的颜色更鲜艳?
A.
通过“图像>调整>亮度/对比度”命令，调整亮度数值
B.
通过“图像>调整>色相/饱和度”命令，调整饱和度数值
C.
通过“图像>调整>色调分离”命令，调整色阶数量
D.
通过“图像>调整>色调均化”命令
【单选题】The record of the past half century has established, I think, the two general principles about human disease. First, it is necessary to know a great deal about underlying mechanisms before one can rea...
A.
Scientific appraisal shows that multifactorial diseases are often due in part to environmental conditions.
B.
In the past half century, scientists have been able to find only a few principles that apply to all diseases.
C.
Each disease has single underlying mechanism that must be understood before the disease can be cured.
D.
Many diseases that were once life-threatening can now be cured by antibiotics.
【简答题】材料一:1965年,云南元谋县上那蚌村西北小山岗上,考古学者发现了两枚上内测门齿,多件粗糙的石器,人工加工痕迹清楚,还发现大量炭屑和两小块烧骨。 材料二:1929年,在中国青年学者裴文中额主持下,于12月2日下午发现了一个完整额头盖骨化石和一些其他部位的骨骼化石,还有大量的打制石器、动物化石和灰烬。 分别说出两则材料所介绍的两个远古人类的名称以及其各自的生活年代。
【单选题】ZX7-02-11一束单色光垂直入射在光栅上,衍射光谱出现5条明纹,若已知此光栅缝宽度与不透明部分宽度相等,那么在中央明纹一侧的两条明纹分别是第____级和第____级谱线。
A.
1；2；
B.
1；3；
C.
2；3；
D.
2；4；
【单选题】天海公司2019年购买商品支付500万元(含增值税),支付2018年接受劳务的未付款项50万元,2019年发生的购货退回15万元,假设不考虑其他条件,天海公司2019年现金流量表“购买商品、接受劳务支付的现金”项目中应填列( )万元。
A.
535
B.
465
C.
435
D.
500
【简答题】A. neither B. thought C. thick D. through
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